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Finding the Fourth Proportional to 86,759.68, 129,891.60 and 81,248.48

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Solution

The fourth proportional to 86,759.68, 129,891.60 and 81,248.48 is: 121,640.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,759.68 : 129,891.60 = 81,248.48 : x
  2. Step 2: Convert to fraction form
    86,759.68/129,891.60 = 81,248.48/x
  3. Step 3: Cross multiply
    86,759.68x = 129,891.60 × 81,248.48
  4. Step 4: Simplify right side
    86,759.68x = 10,553,495,064.77
  5. Step 5: Solve for x
    x = 10,553,495,064.77/86,759.68
  6. Step 6: Final answer
    x = 121,640.55

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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.