Home / 7,987.28-11,979.27-2,142.50

Finding the Fourth Proportional to 7,987.28, 11,979.27 and 2,142.50

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Solution

The fourth proportional to 7,987.28, 11,979.27 and 2,142.50 is: 3,213.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,987.28 : 11,979.27 = 2,142.50 : x
  2. Step 2: Convert to fraction form
    7,987.28/11,979.27 = 2,142.50/x
  3. Step 3: Cross multiply
    7,987.28x = 11,979.27 × 2,142.50
  4. Step 4: Simplify right side
    7,987.28x = 25,665,585.98
  5. Step 5: Solve for x
    x = 25,665,585.98/7,987.28
  6. Step 6: Final answer
    x = 3,213.31

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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.