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Finding the Fourth Proportional to 141.73, 212.10 and 86.86

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Solution

The fourth proportional to 141.73, 212.10 and 86.86 is: 129.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    141.73 : 212.10 = 86.86 : x
  2. Step 2: Convert to fraction form
    141.73/212.10 = 86.86/x
  3. Step 3: Cross multiply
    141.73x = 212.10 × 86.86
  4. Step 4: Simplify right side
    141.73x = 18,422.55
  5. Step 5: Solve for x
    x = 18,422.55/141.73
  6. Step 6: Final answer
    x = 129.99

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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.