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Finding the Fourth Proportional to 139.75, 208.85 and 112.57

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Solution

The fourth proportional to 139.75, 208.85 and 112.57 is: 168.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.75 : 208.85 = 112.57 : x
  2. Step 2: Convert to fraction form
    139.75/208.85 = 112.57/x
  3. Step 3: Cross multiply
    139.75x = 208.85 × 112.57
  4. Step 4: Simplify right side
    139.75x = 23,510.24
  5. Step 5: Solve for x
    x = 23,510.24/139.75
  6. Step 6: Final answer
    x = 168.23

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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.