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Finding the Fourth Proportional to 122.28, 167.76 and 115.32

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Solution

The fourth proportional to 122.28, 167.76 and 115.32 is: 158.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.28 : 167.76 = 115.32 : x
  2. Step 2: Convert to fraction form
    122.28/167.76 = 115.32/x
  3. Step 3: Cross multiply
    122.28x = 167.76 × 115.32
  4. Step 4: Simplify right side
    122.28x = 19,346.08
  5. Step 5: Solve for x
    x = 19,346.08/122.28
  6. Step 6: Final answer
    x = 158.21

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.