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Finding the Fourth Proportional to 140.80, 211.24 and 113.68

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Solution

The fourth proportional to 140.80, 211.24 and 113.68 is: 170.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    140.80 : 211.24 = 113.68 : x
  2. Step 2: Convert to fraction form
    140.80/211.24 = 113.68/x
  3. Step 3: Cross multiply
    140.80x = 211.24 × 113.68
  4. Step 4: Simplify right side
    140.80x = 24,013.76
  5. Step 5: Solve for x
    x = 24,013.76/140.80
  6. Step 6: Final answer
    x = 170.55

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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.