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Finding the Fourth Proportional to 13,859.72, 20,780.09 and 4,974.85

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Solution

The fourth proportional to 13,859.72, 20,780.09 and 4,974.85 is: 7,458.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,859.72 : 20,780.09 = 4,974.85 : x
  2. Step 2: Convert to fraction form
    13,859.72/20,780.09 = 4,974.85/x
  3. Step 3: Cross multiply
    13,859.72x = 20,780.09 × 4,974.85
  4. Step 4: Simplify right side
    13,859.72x = 103,377,805.86
  5. Step 5: Solve for x
    x = 103,377,805.86/13,859.72
  6. Step 6: Final answer
    x = 7,458.87

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1.5x scale

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.