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Finding the Fourth Proportional to 291.47, 402.28 and 167.21

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Solution

The fourth proportional to 291.47, 402.28 and 167.21 is: 230.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    291.47 : 402.28 = 167.21 : x
  2. Step 2: Convert to fraction form
    291.47/402.28 = 167.21/x
  3. Step 3: Cross multiply
    291.47x = 402.28 × 167.21
  4. Step 4: Simplify right side
    291.47x = 67,264.94
  5. Step 5: Solve for x
    x = 67,264.94/291.47
  6. Step 6: Final answer
    x = 230.78

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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.