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Finding the Fourth Proportional to 759.45, 1,139.45 and 326.91

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Solution

The fourth proportional to 759.45, 1,139.45 and 326.91 is: 490.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    759.45 : 1,139.45 = 326.91 : x
  2. Step 2: Convert to fraction form
    759.45/1,139.45 = 326.91/x
  3. Step 3: Cross multiply
    759.45x = 1,139.45 × 326.91
  4. Step 4: Simplify right side
    759.45x = 372,495.96
  5. Step 5: Solve for x
    x = 372,495.96/759.45
  6. Step 6: Final answer
    x = 490.48

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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.