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Finding the Fourth Proportional to 102.55, 141.62 and 87.71

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Solution

The fourth proportional to 102.55, 141.62 and 87.71 is: 121.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    102.55 : 141.62 = 87.71 : x
  2. Step 2: Convert to fraction form
    102.55/141.62 = 87.71/x
  3. Step 3: Cross multiply
    102.55x = 141.62 × 87.71
  4. Step 4: Simplify right side
    102.55x = 12,421.95
  5. Step 5: Solve for x
    x = 12,421.95/102.55
  6. Step 6: Final answer
    x = 121.13

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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.