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Finding the Fourth Proportional to 76,691.52, 115,037.30 and 21,287.52

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Solution

The fourth proportional to 76,691.52, 115,037.30 and 21,287.52 is: 31,931.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,691.52 : 115,037.30 = 21,287.52 : x
  2. Step 2: Convert to fraction form
    76,691.52/115,037.30 = 21,287.52/x
  3. Step 3: Cross multiply
    76,691.52x = 115,037.30 × 21,287.52
  4. Step 4: Simplify right side
    76,691.52x = 2,448,858,824.50
  5. Step 5: Solve for x
    x = 2,448,858,824.50/76,691.52
  6. Step 6: Final answer
    x = 31,931.29

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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.