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Finding the Fourth Proportional to 371.55, 513.15 and 247.78

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Solution

The fourth proportional to 371.55, 513.15 and 247.78 is: 342.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    371.55 : 513.15 = 247.78 : x
  2. Step 2: Convert to fraction form
    371.55/513.15 = 247.78/x
  3. Step 3: Cross multiply
    371.55x = 513.15 × 247.78
  4. Step 4: Simplify right side
    371.55x = 127,147.02
  5. Step 5: Solve for x
    x = 127,147.02/371.55
  6. Step 6: Final answer
    x = 342.21

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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.