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Finding the Fourth Proportional to 752.82, 1,129.62 and 319.86

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Solution

The fourth proportional to 752.82, 1,129.62 and 319.86 is: 479.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    752.82 : 1,129.62 = 319.86 : x
  2. Step 2: Convert to fraction form
    752.82/1,129.62 = 319.86/x
  3. Step 3: Cross multiply
    752.82x = 1,129.62 × 319.86
  4. Step 4: Simplify right side
    752.82x = 361,320.25
  5. Step 5: Solve for x
    x = 361,320.25/752.82
  6. Step 6: Final answer
    x = 479.96

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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.