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Finding the Fourth Proportional to 129.30, 178.48 and 92.46

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Solution

The fourth proportional to 129.30, 178.48 and 92.46 is: 127.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.30 : 178.48 = 92.46 : x
  2. Step 2: Convert to fraction form
    129.30/178.48 = 92.46/x
  3. Step 3: Cross multiply
    129.30x = 178.48 × 92.46
  4. Step 4: Simplify right side
    129.30x = 16,502.26
  5. Step 5: Solve for x
    x = 16,502.26/129.30
  6. Step 6: Final answer
    x = 127.63

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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.