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Finding the Fourth Proportional to 759.60, 1,139.52 and 326.80

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Solution

The fourth proportional to 759.60, 1,139.52 and 326.80 is: 490.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    759.60 : 1,139.52 = 326.80 : x
  2. Step 2: Convert to fraction form
    759.60/1,139.52 = 326.80/x
  3. Step 3: Cross multiply
    759.60x = 1,139.52 × 326.80
  4. Step 4: Simplify right side
    759.60x = 372,395.14
  5. Step 5: Solve for x
    x = 372,395.14/759.60
  6. Step 6: Final answer
    x = 490.25

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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.