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Finding the Fourth Proportional to 77,691.20, 116,565.60 and 74,811.20

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Solution

The fourth proportional to 77,691.20, 116,565.60 and 74,811.20 is: 112,244.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    77,691.20 : 116,565.60 = 74,811.20 : x
  2. Step 2: Convert to fraction form
    77,691.20/116,565.60 = 74,811.20/x
  3. Step 3: Cross multiply
    77,691.20x = 116,565.60 × 74,811.20
  4. Step 4: Simplify right side
    77,691.20x = 8,720,412,414.72
  5. Step 5: Solve for x
    x = 8,720,412,414.72/77,691.20
  6. Step 6: Final answer
    x = 112,244.53

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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.