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Finding the Fourth Proportional to 712,593.52, 983,379.18 and 390,315.15

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Solution

The fourth proportional to 712,593.52, 983,379.18 and 390,315.15 is: 538,634.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    712,593.52 : 983,379.18 = 390,315.15 : x
  2. Step 2: Convert to fraction form
    712,593.52/983,379.18 = 390,315.15/x
  3. Step 3: Cross multiply
    712,593.52x = 983,379.18 × 390,315.15
  4. Step 4: Simplify right side
    712,593.52x = 383,827,792,148.58
  5. Step 5: Solve for x
    x = 383,827,792,148.58/712,593.52
  6. Step 6: Final answer
    x = 538,634.97

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.