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Finding the Fourth Proportional to 139.57, 192.47 and 108.43

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Solution

The fourth proportional to 139.57, 192.47 and 108.43 is: 149.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.57 : 192.47 = 108.43 : x
  2. Step 2: Convert to fraction form
    139.57/192.47 = 108.43/x
  3. Step 3: Cross multiply
    139.57x = 192.47 × 108.43
  4. Step 4: Simplify right side
    139.57x = 20,868.50
  5. Step 5: Solve for x
    x = 20,868.50/139.57
  6. Step 6: Final answer
    x = 149.52

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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.