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Finding the Fourth Proportional to 249.66, 374.18 and 209.16

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Solution

The fourth proportional to 249.66, 374.18 and 209.16 is: 313.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    249.66 : 374.18 = 209.16 : x
  2. Step 2: Convert to fraction form
    249.66/374.18 = 209.16/x
  3. Step 3: Cross multiply
    249.66x = 374.18 × 209.16
  4. Step 4: Simplify right side
    249.66x = 78,262.44
  5. Step 5: Solve for x
    x = 78,262.44/249.66
  6. Step 6: Final answer
    x = 313.48

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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.