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Finding the Fourth Proportional to 139.24, 191.97 and 99.96

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Solution

The fourth proportional to 139.24, 191.97 and 99.96 is: 137.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.24 : 191.97 = 99.96 : x
  2. Step 2: Convert to fraction form
    139.24/191.97 = 99.96/x
  3. Step 3: Cross multiply
    139.24x = 191.97 × 99.96
  4. Step 4: Simplify right side
    139.24x = 19,187.86
  5. Step 5: Solve for x
    x = 19,187.86/139.24
  6. Step 6: Final answer
    x = 137.80

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.