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Finding the Fourth Proportional to 102.39, 141.22 and 81.64

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Solution

The fourth proportional to 102.39, 141.22 and 81.64 is: 112.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    102.39 : 141.22 = 81.64 : x
  2. Step 2: Convert to fraction form
    102.39/141.22 = 81.64/x
  3. Step 3: Cross multiply
    102.39x = 141.22 × 81.64
  4. Step 4: Simplify right side
    102.39x = 11,529.20
  5. Step 5: Solve for x
    x = 11,529.20/102.39
  6. Step 6: Final answer
    x = 112.60

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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.