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Finding the Fourth Proportional to 752.57, 1,128.92 and 319.76

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Solution

The fourth proportional to 752.57, 1,128.92 and 319.76 is: 479.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    752.57 : 1,128.92 = 319.76 : x
  2. Step 2: Convert to fraction form
    752.57/1,128.92 = 319.76/x
  3. Step 3: Cross multiply
    752.57x = 1,128.92 × 319.76
  4. Step 4: Simplify right side
    752.57x = 360,976.22
  5. Step 5: Solve for x
    x = 360,976.22/752.57
  6. Step 6: Final answer
    x = 479.66

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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.