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Finding the Fourth Proportional to 579,743.70, 869,615.55 and 390,786.90

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Solution

The fourth proportional to 579,743.70, 869,615.55 and 390,786.90 is: 586,180.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    579,743.70 : 869,615.55 = 390,786.90 : x
  2. Step 2: Convert to fraction form
    579,743.70/869,615.55 = 390,786.90/x
  3. Step 3: Cross multiply
    579,743.70x = 869,615.55 × 390,786.90
  4. Step 4: Simplify right side
    579,743.70x = 339,834,364,976.30
  5. Step 5: Solve for x
    x = 339,834,364,976.30/579,743.70
  6. Step 6: Final answer
    x = 586,180.35

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Half scale
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Double scale
Find fourth proportional to 579,744.70, 869,617.05 and 390,787.90
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.