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Finding the Fourth Proportional to 141.85, 212.97 and 87.78

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Solution

The fourth proportional to 141.85, 212.97 and 87.78 is: 131.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    141.85 : 212.97 = 87.78 : x
  2. Step 2: Convert to fraction form
    141.85/212.97 = 87.78/x
  3. Step 3: Cross multiply
    141.85x = 212.97 × 87.78
  4. Step 4: Simplify right side
    141.85x = 18,694.51
  5. Step 5: Solve for x
    x = 18,694.51/141.85
  6. Step 6: Final answer
    x = 131.80

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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.