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Finding the Fourth Proportional to 285.22, 393.66 and 167.21

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Solution

The fourth proportional to 285.22, 393.66 and 167.21 is: 230.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.22 : 393.66 = 167.21 : x
  2. Step 2: Convert to fraction form
    285.22/393.66 = 167.21/x
  3. Step 3: Cross multiply
    285.22x = 393.66 × 167.21
  4. Step 4: Simplify right side
    285.22x = 65,825.61
  5. Step 5: Solve for x
    x = 65,825.61/285.22
  6. Step 6: Final answer
    x = 230.79

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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.