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Finding the Fourth Proportional to 78,517.68, 108,351.30 and 42,707.64

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Solution

The fourth proportional to 78,517.68, 108,351.30 and 42,707.64 is: 58,934.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,517.68 : 108,351.30 = 42,707.64 : x
  2. Step 2: Convert to fraction form
    78,517.68/108,351.30 = 42,707.64/x
  3. Step 3: Cross multiply
    78,517.68x = 108,351.30 × 42,707.64
  4. Step 4: Simplify right side
    78,517.68x = 4,627,428,313.93
  5. Step 5: Solve for x
    x = 4,627,428,313.93/78,517.68
  6. Step 6: Final answer
    x = 58,934.86

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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.