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Finding the Fourth Proportional to 718,551.42, 991,587.87 and 396,291.30

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Solution

The fourth proportional to 718,551.42, 991,587.87 and 396,291.30 is: 546,874.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,551.42 : 991,587.87 = 396,291.30 : x
  2. Step 2: Convert to fraction form
    718,551.42/991,587.87 = 396,291.30/x
  3. Step 3: Cross multiply
    718,551.42x = 991,587.87 × 396,291.30
  4. Step 4: Simplify right side
    718,551.42x = 392,957,646,066.53
  5. Step 5: Solve for x
    x = 392,957,646,066.53/718,551.42
  6. Step 6: Final answer
    x = 546,874.77

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Double scale
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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.