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Finding the Fourth Proportional to 139.81, 209.77 and 96.48

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Solution

The fourth proportional to 139.81, 209.77 and 96.48 is: 144.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.81 : 209.77 = 96.48 : x
  2. Step 2: Convert to fraction form
    139.81/209.77 = 96.48/x
  3. Step 3: Cross multiply
    139.81x = 209.77 × 96.48
  4. Step 4: Simplify right side
    139.81x = 20,238.61
  5. Step 5: Solve for x
    x = 20,238.61/139.81
  6. Step 6: Final answer
    x = 144.76

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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.