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Finding the Fourth Proportional to 140.48, 209.92 and 99.68

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Solution

The fourth proportional to 140.48, 209.92 and 99.68 is: 148.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    140.48 : 209.92 = 99.68 : x
  2. Step 2: Convert to fraction form
    140.48/209.92 = 99.68/x
  3. Step 3: Cross multiply
    140.48x = 209.92 × 99.68
  4. Step 4: Simplify right side
    140.48x = 20,924.83
  5. Step 5: Solve for x
    x = 20,924.83/140.48
  6. Step 6: Final answer
    x = 148.95

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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.