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Finding the Fourth Proportional to 249.40, 374.11 and 66.78

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Solution

The fourth proportional to 249.40, 374.11 and 66.78 is: 100.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    249.40 : 374.11 = 66.78 : x
  2. Step 2: Convert to fraction form
    249.40/374.11 = 66.78/x
  3. Step 3: Cross multiply
    249.40x = 374.11 × 66.78
  4. Step 4: Simplify right side
    249.40x = 24,983.07
  5. Step 5: Solve for x
    x = 24,983.07/249.40
  6. Step 6: Final answer
    x = 100.17

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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.