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Finding the Fourth Proportional to 371.12, 512.12 and 223.76

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Solution

The fourth proportional to 371.12, 512.12 and 223.76 is: 308.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    371.12 : 512.12 = 223.76 : x
  2. Step 2: Convert to fraction form
    371.12/512.12 = 223.76/x
  3. Step 3: Cross multiply
    371.12x = 512.12 × 223.76
  4. Step 4: Simplify right side
    371.12x = 114,593.81
  5. Step 5: Solve for x
    x = 114,593.81/371.12
  6. Step 6: Final answer
    x = 308.78

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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.