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Finding the Fourth Proportional to 176.34, 243.51 and 129.78

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Solution

The fourth proportional to 176.34, 243.51 and 129.78 is: 179.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    176.34 : 243.51 = 129.78 : x
  2. Step 2: Convert to fraction form
    176.34/243.51 = 129.78/x
  3. Step 3: Cross multiply
    176.34x = 243.51 × 129.78
  4. Step 4: Simplify right side
    176.34x = 31,602.73
  5. Step 5: Solve for x
    x = 31,602.73/176.34
  6. Step 6: Final answer
    x = 179.21

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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.