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Finding the Fourth Proportional to 139.77, 192.42 and 126.54

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Solution

The fourth proportional to 139.77, 192.42 and 126.54 is: 174.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.77 : 192.42 = 126.54 : x
  2. Step 2: Convert to fraction form
    139.77/192.42 = 126.54/x
  3. Step 3: Cross multiply
    139.77x = 192.42 × 126.54
  4. Step 4: Simplify right side
    139.77x = 24,348.83
  5. Step 5: Solve for x
    x = 24,348.83/139.77
  6. Step 6: Final answer
    x = 174.21

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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.