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Finding the Fourth Proportional to 139.27, 209.21 and 98.95

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Solution

The fourth proportional to 139.27, 209.21 and 98.95 is: 148.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.27 : 209.21 = 98.95 : x
  2. Step 2: Convert to fraction form
    139.27/209.21 = 98.95/x
  3. Step 3: Cross multiply
    139.27x = 209.21 × 98.95
  4. Step 4: Simplify right side
    139.27x = 20,700.39
  5. Step 5: Solve for x
    x = 20,700.39/139.27
  6. Step 6: Final answer
    x = 148.64

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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.