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Finding the Fourth Proportional to 91,685.80, 137,398.94 and 39,042.28

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Solution

The fourth proportional to 91,685.80, 137,398.94 and 39,042.28 is: 58,508.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,685.80 : 137,398.94 = 39,042.28 : x
  2. Step 2: Convert to fraction form
    91,685.80/137,398.94 = 39,042.28/x
  3. Step 3: Cross multiply
    91,685.80x = 137,398.94 × 39,042.28
  4. Step 4: Simplify right side
    91,685.80x = 5,364,367,887.18
  5. Step 5: Solve for x
    x = 5,364,367,887.18/91,685.80
  6. Step 6: Final answer
    x = 58,508.16

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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.