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Finding the Fourth Proportional to 102.56, 141.49 and 63.20

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Solution

The fourth proportional to 102.56, 141.49 and 63.20 is: 87.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    102.56 : 141.49 = 63.20 : x
  2. Step 2: Convert to fraction form
    102.56/141.49 = 63.20/x
  3. Step 3: Cross multiply
    102.56x = 141.49 × 63.20
  4. Step 4: Simplify right side
    102.56x = 8,942.17
  5. Step 5: Solve for x
    x = 8,942.17/102.56
  6. Step 6: Final answer
    x = 87.19

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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.