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Finding the Fourth Proportional to 136,708.10, 205,062.15 and 86,625.80

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Solution

The fourth proportional to 136,708.10, 205,062.15 and 86,625.80 is: 129,938.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    136,708.10 : 205,062.15 = 86,625.80 : x
  2. Step 2: Convert to fraction form
    136,708.10/205,062.15 = 86,625.80/x
  3. Step 3: Cross multiply
    136,708.10x = 205,062.15 × 86,625.80
  4. Step 4: Simplify right side
    136,708.10x = 17,763,672,793.47
  5. Step 5: Solve for x
    x = 17,763,672,793.47/136,708.10
  6. Step 6: Final answer
    x = 129,938.70

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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.