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Finding the Fourth Proportional to 752.32, 1,128.43 and 443.21

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Solution

The fourth proportional to 752.32, 1,128.43 and 443.21 is: 664.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    752.32 : 1,128.43 = 443.21 : x
  2. Step 2: Convert to fraction form
    752.32/1,128.43 = 443.21/x
  3. Step 3: Cross multiply
    752.32x = 1,128.43 × 443.21
  4. Step 4: Simplify right side
    752.32x = 500,126.37
  5. Step 5: Solve for x
    x = 500,126.37/752.32
  6. Step 6: Final answer
    x = 664.78

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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.