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Finding the Fourth Proportional to 539,939.60, 809,909.40 and 390,640.40

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Solution

The fourth proportional to 539,939.60, 809,909.40 and 390,640.40 is: 585,960.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    539,939.60 : 809,909.40 = 390,640.40 : x
  2. Step 2: Convert to fraction form
    539,939.60/809,909.40 = 390,640.40/x
  3. Step 3: Cross multiply
    539,939.60x = 809,909.40 × 390,640.40
  4. Step 4: Simplify right side
    539,939.60x = 316,383,331,979.76
  5. Step 5: Solve for x
    x = 316,383,331,979.76/539,939.60
  6. Step 6: Final answer
    x = 585,960.60

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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.