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Finding the Fourth Proportional to 3,894.86, 5,841.21 and 1,120.78

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Solution

The fourth proportional to 3,894.86, 5,841.21 and 1,120.78 is: 1,680.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,894.86 : 5,841.21 = 1,120.78 : x
  2. Step 2: Convert to fraction form
    3,894.86/5,841.21 = 1,120.78/x
  3. Step 3: Cross multiply
    3,894.86x = 5,841.21 × 1,120.78
  4. Step 4: Simplify right side
    3,894.86x = 6,546,722.85
  5. Step 5: Solve for x
    x = 6,546,722.85/3,894.86
  6. Step 6: Final answer
    x = 1,680.86

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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.