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Finding the Fourth Proportional to 613,387.20, 920,080.80 and 424,430.40

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Solution

The fourth proportional to 613,387.20, 920,080.80 and 424,430.40 is: 636,645.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    613,387.20 : 920,080.80 = 424,430.40 : x
  2. Step 2: Convert to fraction form
    613,387.20/920,080.80 = 424,430.40/x
  3. Step 3: Cross multiply
    613,387.20x = 920,080.80 × 424,430.40
  4. Step 4: Simplify right side
    613,387.20x = 390,510,261,976.32
  5. Step 5: Solve for x
    x = 390,510,261,976.32/613,387.20
  6. Step 6: Final answer
    x = 636,645.60

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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.