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Finding the Fourth Proportional to 371.81, 513.20 and 252.20

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Solution

The fourth proportional to 371.81, 513.20 and 252.20 is: 348.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    371.81 : 513.20 = 252.20 : x
  2. Step 2: Convert to fraction form
    371.81/513.20 = 252.20/x
  3. Step 3: Cross multiply
    371.81x = 513.20 × 252.20
  4. Step 4: Simplify right side
    371.81x = 129,429.04
  5. Step 5: Solve for x
    x = 129,429.04/371.81
  6. Step 6: Final answer
    x = 348.11

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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.