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Finding the Fourth Proportional to 249.28, 373.86 and 78.28

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Solution

The fourth proportional to 249.28, 373.86 and 78.28 is: 117.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    249.28 : 373.86 = 78.28 : x
  2. Step 2: Convert to fraction form
    249.28/373.86 = 78.28/x
  3. Step 3: Cross multiply
    249.28x = 373.86 × 78.28
  4. Step 4: Simplify right side
    249.28x = 29,265.76
  5. Step 5: Solve for x
    x = 29,265.76/249.28
  6. Step 6: Final answer
    x = 117.40

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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.