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Finding the Fourth Proportional to 752.70, 1,127.97 and 428.16

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Solution

The fourth proportional to 752.70, 1,127.97 and 428.16 is: 641.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    752.70 : 1,127.97 = 428.16 : x
  2. Step 2: Convert to fraction form
    752.70/1,127.97 = 428.16/x
  3. Step 3: Cross multiply
    752.70x = 1,127.97 × 428.16
  4. Step 4: Simplify right side
    752.70x = 482,951.64
  5. Step 5: Solve for x
    x = 482,951.64/752.70
  6. Step 6: Final answer
    x = 641.63

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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.