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Finding the Fourth Proportional to 752.62, 1,128.95 and 319.78

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Solution

The fourth proportional to 752.62, 1,128.95 and 319.78 is: 479.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    752.62 : 1,128.95 = 319.78 : x
  2. Step 2: Convert to fraction form
    752.62/1,128.95 = 319.78/x
  3. Step 3: Cross multiply
    752.62x = 1,128.95 × 319.78
  4. Step 4: Simplify right side
    752.62x = 361,015.63
  5. Step 5: Solve for x
    x = 361,015.63/752.62
  6. Step 6: Final answer
    x = 479.68

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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.