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Finding the Fourth Proportional to 752.98, 1,129.46 and 205.15

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Solution

The fourth proportional to 752.98, 1,129.46 and 205.15 is: 307.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    752.98 : 1,129.46 = 205.15 : x
  2. Step 2: Convert to fraction form
    752.98/1,129.46 = 205.15/x
  3. Step 3: Cross multiply
    752.98x = 1,129.46 × 205.15
  4. Step 4: Simplify right side
    752.98x = 231,707.69
  5. Step 5: Solve for x
    x = 231,707.69/752.98
  6. Step 6: Final answer
    x = 307.72

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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.