Home / 579,816.20-869,724.30-390,859.40

Finding the Fourth Proportional to 579,816.20, 869,724.30 and 390,859.40

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Solution

The fourth proportional to 579,816.20, 869,724.30 and 390,859.40 is: 586,289.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    579,816.20 : 869,724.30 = 390,859.40 : x
  2. Step 2: Convert to fraction form
    579,816.20/869,724.30 = 390,859.40/x
  3. Step 3: Cross multiply
    579,816.20x = 869,724.30 × 390,859.40
  4. Step 4: Simplify right side
    579,816.20x = 339,939,918,063.42
  5. Step 5: Solve for x
    x = 339,939,918,063.42/579,816.20
  6. Step 6: Final answer
    x = 586,289.10

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Half scale
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Double scale
Find fourth proportional to 579,817.20, 869,725.80 and 390,860.40
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.