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Finding the Fourth Proportional to 759.36, 1,139.28 and 326.72

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Solution

The fourth proportional to 759.36, 1,139.28 and 326.72 is: 490.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    759.36 : 1,139.28 = 326.72 : x
  2. Step 2: Convert to fraction form
    759.36/1,139.28 = 326.72/x
  3. Step 3: Cross multiply
    759.36x = 1,139.28 × 326.72
  4. Step 4: Simplify right side
    759.36x = 372,225.56
  5. Step 5: Solve for x
    x = 372,225.56/759.36
  6. Step 6: Final answer
    x = 490.18

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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.