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Finding the Fourth Proportional to 78,390.27, 108,104.90 and 60,456.87

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Solution

The fourth proportional to 78,390.27, 108,104.90 and 60,456.87 is: 83,373.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,390.27 : 108,104.90 = 60,456.87 : x
  2. Step 2: Convert to fraction form
    78,390.27/108,104.90 = 60,456.87/x
  3. Step 3: Cross multiply
    78,390.27x = 108,104.90 × 60,456.87
  4. Step 4: Simplify right side
    78,390.27x = 6,535,683,583.38
  5. Step 5: Solve for x
    x = 6,535,683,583.38/78,390.27
  6. Step 6: Final answer
    x = 83,373.66

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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.