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Finding the Fourth Proportional to 136,781.69, 188,761.92 and 85,796.57

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Solution

The fourth proportional to 136,781.69, 188,761.92 and 85,796.57 is: 118,401.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    136,781.69 : 188,761.92 = 85,796.57 : x
  2. Step 2: Convert to fraction form
    136,781.69/188,761.92 = 85,796.57/x
  3. Step 3: Cross multiply
    136,781.69x = 188,761.92 × 85,796.57
  4. Step 4: Simplify right side
    136,781.69x = 16,195,124,612.30
  5. Step 5: Solve for x
    x = 16,195,124,612.30/136,781.69
  6. Step 6: Final answer
    x = 118,401.26

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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.