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Finding the Fourth Proportional to 759.79, 1,138.91 and 576.80

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Solution

The fourth proportional to 759.79, 1,138.91 and 576.80 is: 864.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    759.79 : 1,138.91 = 576.80 : x
  2. Step 2: Convert to fraction form
    759.79/1,138.91 = 576.80/x
  3. Step 3: Cross multiply
    759.79x = 1,138.91 × 576.80
  4. Step 4: Simplify right side
    759.79x = 656,921.14
  5. Step 5: Solve for x
    x = 656,921.14/759.79
  6. Step 6: Final answer
    x = 864.61

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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.