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Finding the Fourth Proportional to 306.49, 422.95 and 166.61

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Solution

The fourth proportional to 306.49, 422.95 and 166.61 is: 229.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    306.49 : 422.95 = 166.61 : x
  2. Step 2: Convert to fraction form
    306.49/422.95 = 166.61/x
  3. Step 3: Cross multiply
    306.49x = 422.95 × 166.61
  4. Step 4: Simplify right side
    306.49x = 70,464.75
  5. Step 5: Solve for x
    x = 70,464.75/306.49
  6. Step 6: Final answer
    x = 229.91

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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.