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Finding the Fourth Proportional to 579,816.40, 869,724.60 and 390,859.60

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Solution

The fourth proportional to 579,816.40, 869,724.60 and 390,859.60 is: 586,289.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    579,816.40 : 869,724.60 = 390,859.60 : x
  2. Step 2: Convert to fraction form
    579,816.40/869,724.60 = 390,859.60/x
  3. Step 3: Cross multiply
    579,816.40x = 869,724.60 × 390,859.60
  4. Step 4: Simplify right side
    579,816.40x = 339,940,209,266.16
  5. Step 5: Solve for x
    x = 339,940,209,266.16/579,816.40
  6. Step 6: Final answer
    x = 586,289.40

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Half scale
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Double scale
Find fourth proportional to 579,817.40, 869,726.10 and 390,860.60
Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.