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Finding the Fourth Proportional to 140.32, 209.20 and 136.71

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Solution

The fourth proportional to 140.32, 209.20 and 136.71 is: 203.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    140.32 : 209.20 = 136.71 : x
  2. Step 2: Convert to fraction form
    140.32/209.20 = 136.71/x
  3. Step 3: Cross multiply
    140.32x = 209.20 × 136.71
  4. Step 4: Simplify right side
    140.32x = 28,599.65
  5. Step 5: Solve for x
    x = 28,599.65/140.32
  6. Step 6: Final answer
    x = 203.82

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.