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Finding the Fourth Proportional to 249.38, 374.07 and 78.38

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Solution

The fourth proportional to 249.38, 374.07 and 78.38 is: 117.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    249.38 : 374.07 = 78.38 : x
  2. Step 2: Convert to fraction form
    249.38/374.07 = 78.38/x
  3. Step 3: Cross multiply
    249.38x = 374.07 × 78.38
  4. Step 4: Simplify right side
    249.38x = 29,317.74
  5. Step 5: Solve for x
    x = 29,317.74/249.38
  6. Step 6: Final answer
    x = 117.56

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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.