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Finding the Fourth Proportional to 129.42, 178.50 and 92.56

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Solution

The fourth proportional to 129.42, 178.50 and 92.56 is: 127.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.42 : 178.50 = 92.56 : x
  2. Step 2: Convert to fraction form
    129.42/178.50 = 92.56/x
  3. Step 3: Cross multiply
    129.42x = 178.50 × 92.56
  4. Step 4: Simplify right side
    129.42x = 16,521.50
  5. Step 5: Solve for x
    x = 16,521.50/129.42
  6. Step 6: Final answer
    x = 127.66

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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.