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Finding the Fourth Proportional to 140.76, 211.20 and 136.30

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Solution

The fourth proportional to 140.76, 211.20 and 136.30 is: 204.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    140.76 : 211.20 = 136.30 : x
  2. Step 2: Convert to fraction form
    140.76/211.20 = 136.30/x
  3. Step 3: Cross multiply
    140.76x = 211.20 × 136.30
  4. Step 4: Simplify right side
    140.76x = 28,786.56
  5. Step 5: Solve for x
    x = 28,786.56/140.76
  6. Step 6: Final answer
    x = 204.51

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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.