Home / 3,939.78-5,909.76-1,306.44

Finding the Fourth Proportional to 3,939.78, 5,909.76 and 1,306.44

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Solution

The fourth proportional to 3,939.78, 5,909.76 and 1,306.44 is: 1,959.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,939.78 : 5,909.76 = 1,306.44 : x
  2. Step 2: Convert to fraction form
    3,939.78/5,909.76 = 1,306.44/x
  3. Step 3: Cross multiply
    3,939.78x = 5,909.76 × 1,306.44
  4. Step 4: Simplify right side
    3,939.78x = 7,720,746.85
  5. Step 5: Solve for x
    x = 7,720,746.85/3,939.78
  6. Step 6: Final answer
    x = 1,959.69

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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.