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Finding the Fourth Proportional to 758.73, 1,138.08 and 319.87

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Solution

The fourth proportional to 758.73, 1,138.08 and 319.87 is: 479.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    758.73 : 1,138.08 = 319.87 : x
  2. Step 2: Convert to fraction form
    758.73/1,138.08 = 319.87/x
  3. Step 3: Cross multiply
    758.73x = 1,138.08 × 319.87
  4. Step 4: Simplify right side
    758.73x = 364,034.80
  5. Step 5: Solve for x
    x = 364,034.80/758.73
  6. Step 6: Final answer
    x = 479.79

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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.