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Finding the Fourth Proportional to 102.07, 140.96 and 87.43

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Solution

The fourth proportional to 102.07, 140.96 and 87.43 is: 120.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    102.07 : 140.96 = 87.43 : x
  2. Step 2: Convert to fraction form
    102.07/140.96 = 87.43/x
  3. Step 3: Cross multiply
    102.07x = 140.96 × 87.43
  4. Step 4: Simplify right side
    102.07x = 12,324.13
  5. Step 5: Solve for x
    x = 12,324.13/102.07
  6. Step 6: Final answer
    x = 120.74

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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.