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Finding the Fourth Proportional to 371.16, 512.20 and 205.40

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Solution

The fourth proportional to 371.16, 512.20 and 205.40 is: 283.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    371.16 : 512.20 = 205.40 : x
  2. Step 2: Convert to fraction form
    371.16/512.20 = 205.40/x
  3. Step 3: Cross multiply
    371.16x = 512.20 × 205.40
  4. Step 4: Simplify right side
    371.16x = 105,205.88
  5. Step 5: Solve for x
    x = 105,205.88/371.16
  6. Step 6: Final answer
    x = 283.45

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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.