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Finding the Fourth Proportional to 3,920.78, 5,404.64 and 2,799.74

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Solution

The fourth proportional to 3,920.78, 5,404.64 and 2,799.74 is: 3,859.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,920.78 : 5,404.64 = 2,799.74 : x
  2. Step 2: Convert to fraction form
    3,920.78/5,404.64 = 2,799.74/x
  3. Step 3: Cross multiply
    3,920.78x = 5,404.64 × 2,799.74
  4. Step 4: Simplify right side
    3,920.78x = 15,131,586.79
  5. Step 5: Solve for x
    x = 15,131,586.79/3,920.78
  6. Step 6: Final answer
    x = 3,859.33

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.