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Finding the Fourth Proportional to 211.31, 316.61 and 129.92

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Solution

The fourth proportional to 211.31, 316.61 and 129.92 is: 194.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.31 : 316.61 = 129.92 : x
  2. Step 2: Convert to fraction form
    211.31/316.61 = 129.92/x
  3. Step 3: Cross multiply
    211.31x = 316.61 × 129.92
  4. Step 4: Simplify right side
    211.31x = 41,132.71
  5. Step 5: Solve for x
    x = 41,132.71/211.31
  6. Step 6: Final answer
    x = 194.66

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.