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Finding the Fourth Proportional to 78,373.32, 117,565.62 and 38,890.68

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Solution

The fourth proportional to 78,373.32, 117,565.62 and 38,890.68 is: 58,338.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,373.32 : 117,565.62 = 38,890.68 : x
  2. Step 2: Convert to fraction form
    78,373.32/117,565.62 = 38,890.68/x
  3. Step 3: Cross multiply
    78,373.32x = 117,565.62 × 38,890.68
  4. Step 4: Simplify right side
    78,373.32x = 4,572,206,906.42
  5. Step 5: Solve for x
    x = 4,572,206,906.42/78,373.32
  6. Step 6: Final answer
    x = 58,338.82

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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.