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Finding the Fourth Proportional to 752.85, 1,129.28 and 205.12

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Solution

The fourth proportional to 752.85, 1,129.28 and 205.12 is: 307.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    752.85 : 1,129.28 = 205.12 : x
  2. Step 2: Convert to fraction form
    752.85/1,129.28 = 205.12/x
  3. Step 3: Cross multiply
    752.85x = 1,129.28 × 205.12
  4. Step 4: Simplify right side
    752.85x = 231,635.09
  5. Step 5: Solve for x
    x = 231,635.09/752.85
  6. Step 6: Final answer
    x = 307.68

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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.