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Finding the Fourth Proportional to 759.38, 1,139.60 and 265.79

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Solution

The fourth proportional to 759.38, 1,139.60 and 265.79 is: 398.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    759.38 : 1,139.60 = 265.79 : x
  2. Step 2: Convert to fraction form
    759.38/1,139.60 = 265.79/x
  3. Step 3: Cross multiply
    759.38x = 1,139.60 × 265.79
  4. Step 4: Simplify right side
    759.38x = 302,895.80
  5. Step 5: Solve for x
    x = 302,895.80/759.38
  6. Step 6: Final answer
    x = 398.87

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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.