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Finding the Fourth Proportional to 139.26, 192.16 and 87.54

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Solution

The fourth proportional to 139.26, 192.16 and 87.54 is: 120.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.26 : 192.16 = 87.54 : x
  2. Step 2: Convert to fraction form
    139.26/192.16 = 87.54/x
  3. Step 3: Cross multiply
    139.26x = 192.16 × 87.54
  4. Step 4: Simplify right side
    139.26x = 16,821.69
  5. Step 5: Solve for x
    x = 16,821.69/139.26
  6. Step 6: Final answer
    x = 120.79

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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.