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Finding the Fourth Proportional to 759.89, 1,139.52 and 321.35

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Solution

The fourth proportional to 759.89, 1,139.52 and 321.35 is: 481.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    759.89 : 1,139.52 = 321.35 : x
  2. Step 2: Convert to fraction form
    759.89/1,139.52 = 321.35/x
  3. Step 3: Cross multiply
    759.89x = 1,139.52 × 321.35
  4. Step 4: Simplify right side
    759.89x = 366,180.26
  5. Step 5: Solve for x
    x = 366,180.26/759.89
  6. Step 6: Final answer
    x = 481.88

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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.