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Finding the Fourth Proportional to 140.91, 211.28 and 72.47

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Solution

The fourth proportional to 140.91, 211.28 and 72.47 is: 108.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    140.91 : 211.28 = 72.47 : x
  2. Step 2: Convert to fraction form
    140.91/211.28 = 72.47/x
  3. Step 3: Cross multiply
    140.91x = 211.28 × 72.47
  4. Step 4: Simplify right side
    140.91x = 15,310.04
  5. Step 5: Solve for x
    x = 15,310.04/140.91
  6. Step 6: Final answer
    x = 108.65

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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.