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Finding the Fourth Proportional to 249.63, 345.11 and 218.85

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Solution

The fourth proportional to 249.63, 345.11 and 218.85 is: 302.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    249.63 : 345.11 = 218.85 : x
  2. Step 2: Convert to fraction form
    249.63/345.11 = 218.85/x
  3. Step 3: Cross multiply
    249.63x = 345.11 × 218.85
  4. Step 4: Simplify right side
    249.63x = 75,526.23
  5. Step 5: Solve for x
    x = 75,526.23/249.63
  6. Step 6: Final answer
    x = 302.55

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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.