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Finding the Fourth Proportional to 759.32, 1,139.28 and 326.48

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Solution

The fourth proportional to 759.32, 1,139.28 and 326.48 is: 489.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    759.32 : 1,139.28 = 326.48 : x
  2. Step 2: Convert to fraction form
    759.32/1,139.28 = 326.48/x
  3. Step 3: Cross multiply
    759.32x = 1,139.28 × 326.48
  4. Step 4: Simplify right side
    759.32x = 371,952.13
  5. Step 5: Solve for x
    x = 371,952.13/759.32
  6. Step 6: Final answer
    x = 489.85

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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.