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Finding the Fourth Proportional to 291.55, 402.38 and 167.28

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Solution

The fourth proportional to 291.55, 402.38 and 167.28 is: 230.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    291.55 : 402.38 = 167.28 : x
  2. Step 2: Convert to fraction form
    291.55/402.38 = 167.28/x
  3. Step 3: Cross multiply
    291.55x = 402.38 × 167.28
  4. Step 4: Simplify right side
    291.55x = 67,311.61
  5. Step 5: Solve for x
    x = 67,311.61/291.55
  6. Step 6: Final answer
    x = 230.88

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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.