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Finding the Fourth Proportional to 129,251.52, 178,398.72 and 78,992.64

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Solution

The fourth proportional to 129,251.52, 178,398.72 and 78,992.64 is: 109,029.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,251.52 : 178,398.72 = 78,992.64 : x
  2. Step 2: Convert to fraction form
    129,251.52/178,398.72 = 78,992.64/x
  3. Step 3: Cross multiply
    129,251.52x = 178,398.72 × 78,992.64
  4. Step 4: Simplify right side
    129,251.52x = 14,092,185,865.42
  5. Step 5: Solve for x
    x = 14,092,185,865.42/129,251.52
  6. Step 6: Final answer
    x = 109,029.17

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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.