Home / 3,987.20-5,980.82-1,213.90

Finding the Fourth Proportional to 3,987.20, 5,980.82 and 1,213.90

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Solution

The fourth proportional to 3,987.20, 5,980.82 and 1,213.90 is: 1,820.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,987.20 : 5,980.82 = 1,213.90 : x
  2. Step 2: Convert to fraction form
    3,987.20/5,980.82 = 1,213.90/x
  3. Step 3: Cross multiply
    3,987.20x = 5,980.82 × 1,213.90
  4. Step 4: Simplify right side
    3,987.20x = 7,260,096.38
  5. Step 5: Solve for x
    x = 7,260,096.38/3,987.20
  6. Step 6: Final answer
    x = 1,820.85

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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.