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Finding the Fourth Proportional to 102.70, 141.41 and 86.29

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Solution

The fourth proportional to 102.70, 141.41 and 86.29 is: 118.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    102.70 : 141.41 = 86.29 : x
  2. Step 2: Convert to fraction form
    102.70/141.41 = 86.29/x
  3. Step 3: Cross multiply
    102.70x = 141.41 × 86.29
  4. Step 4: Simplify right side
    102.70x = 12,201.13
  5. Step 5: Solve for x
    x = 12,201.13/102.70
  6. Step 6: Final answer
    x = 118.81

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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.