Home / 3,987.36-5,976.96-1,388.88

Finding the Fourth Proportional to 3,987.36, 5,976.96 and 1,388.88

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Solution

The fourth proportional to 3,987.36, 5,976.96 and 1,388.88 is: 2,081.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,987.36 : 5,976.96 = 1,388.88 : x
  2. Step 2: Convert to fraction form
    3,987.36/5,976.96 = 1,388.88/x
  3. Step 3: Cross multiply
    3,987.36x = 5,976.96 × 1,388.88
  4. Step 4: Simplify right side
    3,987.36x = 8,301,280.20
  5. Step 5: Solve for x
    x = 8,301,280.20/3,987.36
  6. Step 6: Final answer
    x = 2,081.90

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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.