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Finding the Fourth Proportional to 229.22, 316.32 and 129.64

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Solution

The fourth proportional to 229.22, 316.32 and 129.64 is: 178.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    229.22 : 316.32 = 129.64 : x
  2. Step 2: Convert to fraction form
    229.22/316.32 = 129.64/x
  3. Step 3: Cross multiply
    229.22x = 316.32 × 129.64
  4. Step 4: Simplify right side
    229.22x = 41,007.72
  5. Step 5: Solve for x
    x = 41,007.72/229.22
  6. Step 6: Final answer
    x = 178.90

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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.