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Finding the Fourth Proportional to 249.44, 374.08 and 78.40

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Solution

The fourth proportional to 249.44, 374.08 and 78.40 is: 117.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    249.44 : 374.08 = 78.40 : x
  2. Step 2: Convert to fraction form
    249.44/374.08 = 78.40/x
  3. Step 3: Cross multiply
    249.44x = 374.08 × 78.40
  4. Step 4: Simplify right side
    249.44x = 29,327.87
  5. Step 5: Solve for x
    x = 29,327.87/249.44
  6. Step 6: Final answer
    x = 117.57

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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.