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Finding the Fourth Proportional to 141.71, 212.70 and 87.71

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Solution

The fourth proportional to 141.71, 212.70 and 87.71 is: 131.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    141.71 : 212.70 = 87.71 : x
  2. Step 2: Convert to fraction form
    141.71/212.70 = 87.71/x
  3. Step 3: Cross multiply
    141.71x = 212.70 × 87.71
  4. Step 4: Simplify right side
    141.71x = 18,655.92
  5. Step 5: Solve for x
    x = 18,655.92/141.71
  6. Step 6: Final answer
    x = 131.65

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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.