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Finding the Fourth Proportional to 141.01, 211.43 and 86.18

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Solution

The fourth proportional to 141.01, 211.43 and 86.18 is: 129.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    141.01 : 211.43 = 86.18 : x
  2. Step 2: Convert to fraction form
    141.01/211.43 = 86.18/x
  3. Step 3: Cross multiply
    141.01x = 211.43 × 86.18
  4. Step 4: Simplify right side
    141.01x = 18,220.90
  5. Step 5: Solve for x
    x = 18,220.90/141.01
  6. Step 6: Final answer
    x = 129.22

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.