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Finding the Fourth Proportional to 140.12, 209.12 and 136.47

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Solution

The fourth proportional to 140.12, 209.12 and 136.47 is: 203.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    140.12 : 209.12 = 136.47 : x
  2. Step 2: Convert to fraction form
    140.12/209.12 = 136.47/x
  3. Step 3: Cross multiply
    140.12x = 209.12 × 136.47
  4. Step 4: Simplify right side
    140.12x = 28,538.63
  5. Step 5: Solve for x
    x = 28,538.63/140.12
  6. Step 6: Final answer
    x = 203.68

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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.