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Finding the Fourth Proportional to 752.46, 1,128.70 and 319.30

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Solution

The fourth proportional to 752.46, 1,128.70 and 319.30 is: 478.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    752.46 : 1,128.70 = 319.30 : x
  2. Step 2: Convert to fraction form
    752.46/1,128.70 = 319.30/x
  3. Step 3: Cross multiply
    752.46x = 1,128.70 × 319.30
  4. Step 4: Simplify right side
    752.46x = 360,393.91
  5. Step 5: Solve for x
    x = 360,393.91/752.46
  6. Step 6: Final answer
    x = 478.95

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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.