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Finding the Fourth Proportional to 139.97, 209.93 and 98.98

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Solution

The fourth proportional to 139.97, 209.93 and 98.98 is: 148.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.97 : 209.93 = 98.98 : x
  2. Step 2: Convert to fraction form
    139.97/209.93 = 98.98/x
  3. Step 3: Cross multiply
    139.97x = 209.93 × 98.98
  4. Step 4: Simplify right side
    139.97x = 20,777.85
  5. Step 5: Solve for x
    x = 20,777.85/139.97
  6. Step 6: Final answer
    x = 148.44

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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.