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Finding the Fourth Proportional to 200.75, 301.08 and 85.20

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Solution

The fourth proportional to 200.75, 301.08 and 85.20 is: 127.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    200.75 : 301.08 = 85.20 : x
  2. Step 2: Convert to fraction form
    200.75/301.08 = 85.20/x
  3. Step 3: Cross multiply
    200.75x = 301.08 × 85.20
  4. Step 4: Simplify right side
    200.75x = 25,652.02
  5. Step 5: Solve for x
    x = 25,652.02/200.75
  6. Step 6: Final answer
    x = 127.78

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.