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Finding the Fourth Proportional to 371.55, 512.71 and 205.78

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Solution

The fourth proportional to 371.55, 512.71 and 205.78 is: 283.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    371.55 : 512.71 = 205.78 : x
  2. Step 2: Convert to fraction form
    371.55/512.71 = 205.78/x
  3. Step 3: Cross multiply
    371.55x = 512.71 × 205.78
  4. Step 4: Simplify right side
    371.55x = 105,505.46
  5. Step 5: Solve for x
    x = 105,505.46/371.55
  6. Step 6: Final answer
    x = 283.96

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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.