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Finding the Fourth Proportional to 140.88, 211.17 and 54.15

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Solution

The fourth proportional to 140.88, 211.17 and 54.15 is: 81.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    140.88 : 211.17 = 54.15 : x
  2. Step 2: Convert to fraction form
    140.88/211.17 = 54.15/x
  3. Step 3: Cross multiply
    140.88x = 211.17 × 54.15
  4. Step 4: Simplify right side
    140.88x = 11,434.86
  5. Step 5: Solve for x
    x = 11,434.86/140.88
  6. Step 6: Final answer
    x = 81.17

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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.