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Finding the Fourth Proportional to 122.76, 185.18 and 115.47

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Solution

The fourth proportional to 122.76, 185.18 and 115.47 is: 174.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.76 : 185.18 = 115.47 : x
  2. Step 2: Convert to fraction form
    122.76/185.18 = 115.47/x
  3. Step 3: Cross multiply
    122.76x = 185.18 × 115.47
  4. Step 4: Simplify right side
    122.76x = 21,382.16
  5. Step 5: Solve for x
    x = 21,382.16/122.76
  6. Step 6: Final answer
    x = 174.18

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.