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Finding the Fourth Proportional to 139.65, 192.56 and 115.04

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Solution

The fourth proportional to 139.65, 192.56 and 115.04 is: 158.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.65 : 192.56 = 115.04 : x
  2. Step 2: Convert to fraction form
    139.65/192.56 = 115.04/x
  3. Step 3: Cross multiply
    139.65x = 192.56 × 115.04
  4. Step 4: Simplify right side
    139.65x = 22,150.56
  5. Step 5: Solve for x
    x = 22,150.56/139.65
  6. Step 6: Final answer
    x = 158.61

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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.