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Finding the Fourth Proportional to 139.91, 192.80 and 115.52

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Solution

The fourth proportional to 139.91, 192.80 and 115.52 is: 159.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.91 : 192.80 = 115.52 : x
  2. Step 2: Convert to fraction form
    139.91/192.80 = 115.52/x
  3. Step 3: Cross multiply
    139.91x = 192.80 × 115.52
  4. Step 4: Simplify right side
    139.91x = 22,271.68
  5. Step 5: Solve for x
    x = 22,271.68/139.91
  6. Step 6: Final answer
    x = 159.19

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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.