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Finding the Fourth Proportional to 371.28, 512.61 and 231.60

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Solution

The fourth proportional to 371.28, 512.61 and 231.60 is: 319.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    371.28 : 512.61 = 231.60 : x
  2. Step 2: Convert to fraction form
    371.28/512.61 = 231.60/x
  3. Step 3: Cross multiply
    371.28x = 512.61 × 231.60
  4. Step 4: Simplify right side
    371.28x = 118,720.48
  5. Step 5: Solve for x
    x = 118,720.48/371.28
  6. Step 6: Final answer
    x = 319.76

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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.