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Finding the Fourth Proportional to 191.55, 264.42 and 121.61

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Solution

The fourth proportional to 191.55, 264.42 and 121.61 is: 167.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    191.55 : 264.42 = 121.61 : x
  2. Step 2: Convert to fraction form
    191.55/264.42 = 121.61/x
  3. Step 3: Cross multiply
    191.55x = 264.42 × 121.61
  4. Step 4: Simplify right side
    191.55x = 32,156.78
  5. Step 5: Solve for x
    x = 32,156.78/191.55
  6. Step 6: Final answer
    x = 167.88

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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.