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Finding the Fourth Proportional to 176.31, 242.91 and 129.38

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Solution

The fourth proportional to 176.31, 242.91 and 129.38 is: 178.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    176.31 : 242.91 = 129.38 : x
  2. Step 2: Convert to fraction form
    176.31/242.91 = 129.38/x
  3. Step 3: Cross multiply
    176.31x = 242.91 × 129.38
  4. Step 4: Simplify right side
    176.31x = 31,426.48
  5. Step 5: Solve for x
    x = 31,426.48/176.31
  6. Step 6: Final answer
    x = 178.25

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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.