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Finding the Fourth Proportional to 229.30, 316.47 and 129.74

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Solution

The fourth proportional to 229.30, 316.47 and 129.74 is: 179.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    229.30 : 316.47 = 129.74 : x
  2. Step 2: Convert to fraction form
    229.30/316.47 = 129.74/x
  3. Step 3: Cross multiply
    229.30x = 316.47 × 129.74
  4. Step 4: Simplify right side
    229.30x = 41,057.72
  5. Step 5: Solve for x
    x = 41,057.72/229.30
  6. Step 6: Final answer
    x = 179.06

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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.