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Finding the Fourth Proportional to 129.72, 178.99 and 77.27

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Solution

The fourth proportional to 129.72, 178.99 and 77.27 is: 106.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.72 : 178.99 = 77.27 : x
  2. Step 2: Convert to fraction form
    129.72/178.99 = 77.27/x
  3. Step 3: Cross multiply
    129.72x = 178.99 × 77.27
  4. Step 4: Simplify right side
    129.72x = 13,830.43
  5. Step 5: Solve for x
    x = 13,830.43/129.72
  6. Step 6: Final answer
    x = 106.61

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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.