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Finding the Fourth Proportional to 129,326.72, 178,519.20 and 84,614.72

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Solution

The fourth proportional to 129,326.72, 178,519.20 and 84,614.72 is: 116,799.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,326.72 : 178,519.20 = 84,614.72 : x
  2. Step 2: Convert to fraction form
    129,326.72/178,519.20 = 84,614.72/x
  3. Step 3: Cross multiply
    129,326.72x = 178,519.20 × 84,614.72
  4. Step 4: Simplify right side
    129,326.72x = 15,105,352,122.62
  5. Step 5: Solve for x
    x = 15,105,352,122.62/129,326.72
  6. Step 6: Final answer
    x = 116,799.93

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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.