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Finding the Fourth Proportional to 3,987.76, 5,982.86 and 2,138.80

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Solution

The fourth proportional to 3,987.76, 5,982.86 and 2,138.80 is: 3,208.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,987.76 : 5,982.86 = 2,138.80 : x
  2. Step 2: Convert to fraction form
    3,987.76/5,982.86 = 2,138.80/x
  3. Step 3: Cross multiply
    3,987.76x = 5,982.86 × 2,138.80
  4. Step 4: Simplify right side
    3,987.76x = 12,796,140.97
  5. Step 5: Solve for x
    x = 12,796,140.97/3,987.76
  6. Step 6: Final answer
    x = 3,208.85

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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.