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Finding the Fourth Proportional to 249.98, 345.12 and 161.61

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Solution

The fourth proportional to 249.98, 345.12 and 161.61 is: 223.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    249.98 : 345.12 = 161.61 : x
  2. Step 2: Convert to fraction form
    249.98/345.12 = 161.61/x
  3. Step 3: Cross multiply
    249.98x = 345.12 × 161.61
  4. Step 4: Simplify right side
    249.98x = 55,774.04
  5. Step 5: Solve for x
    x = 55,774.04/249.98
  6. Step 6: Final answer
    x = 223.12

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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.