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Finding the Fourth Proportional to 229.72, 316.96 and 131.46

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Solution

The fourth proportional to 229.72, 316.96 and 131.46 is: 181.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    229.72 : 316.96 = 131.46 : x
  2. Step 2: Convert to fraction form
    229.72/316.96 = 131.46/x
  3. Step 3: Cross multiply
    229.72x = 316.96 × 131.46
  4. Step 4: Simplify right side
    229.72x = 41,666.78
  5. Step 5: Solve for x
    x = 41,666.78/229.72
  6. Step 6: Final answer
    x = 181.38

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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.