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Finding the Fourth Proportional to 141.33, 211.65 and 87.12

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Solution

The fourth proportional to 141.33, 211.65 and 87.12 is: 130.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    141.33 : 211.65 = 87.12 : x
  2. Step 2: Convert to fraction form
    141.33/211.65 = 87.12/x
  3. Step 3: Cross multiply
    141.33x = 211.65 × 87.12
  4. Step 4: Simplify right side
    141.33x = 18,438.95
  5. Step 5: Solve for x
    x = 18,438.95/141.33
  6. Step 6: Final answer
    x = 130.47

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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.