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Finding the Fourth Proportional to 371.11, 512.28 and 311.89

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Solution

The fourth proportional to 371.11, 512.28 and 311.89 is: 430.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    371.11 : 512.28 = 311.89 : x
  2. Step 2: Convert to fraction form
    371.11/512.28 = 311.89/x
  3. Step 3: Cross multiply
    371.11x = 512.28 × 311.89
  4. Step 4: Simplify right side
    371.11x = 159,775.01
  5. Step 5: Solve for x
    x = 159,775.01/371.11
  6. Step 6: Final answer
    x = 430.53

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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.