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Finding the Fourth Proportional to 371.86, 513.20 and 247.78

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Solution

The fourth proportional to 371.86, 513.20 and 247.78 is: 341.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    371.86 : 513.20 = 247.78 : x
  2. Step 2: Convert to fraction form
    371.86/513.20 = 247.78/x
  3. Step 3: Cross multiply
    371.86x = 513.20 × 247.78
  4. Step 4: Simplify right side
    371.86x = 127,160.70
  5. Step 5: Solve for x
    x = 127,160.70/371.86
  6. Step 6: Final answer
    x = 341.96

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.