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Finding the Fourth Proportional to 3,480.55, 5,220.86 and 2,786.31

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Solution

The fourth proportional to 3,480.55, 5,220.86 and 2,786.31 is: 4,179.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,480.55 : 5,220.86 = 2,786.31 : x
  2. Step 2: Convert to fraction form
    3,480.55/5,220.86 = 2,786.31/x
  3. Step 3: Cross multiply
    3,480.55x = 5,220.86 × 2,786.31
  4. Step 4: Simplify right side
    3,480.55x = 14,546,934.43
  5. Step 5: Solve for x
    x = 14,546,934.43/3,480.55
  6. Step 6: Final answer
    x = 4,179.49

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Double scale
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Similar ratio
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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.