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Finding the Fourth Proportional to 249.90, 374.40 and 211.20

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Solution

The fourth proportional to 249.90, 374.40 and 211.20 is: 316.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    249.90 : 374.40 = 211.20 : x
  2. Step 2: Convert to fraction form
    249.90/374.40 = 211.20/x
  3. Step 3: Cross multiply
    249.90x = 374.40 × 211.20
  4. Step 4: Simplify right side
    249.90x = 79,073.28
  5. Step 5: Solve for x
    x = 79,073.28/249.90
  6. Step 6: Final answer
    x = 316.42

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.