Home / 7,921.24-11,872.68-2,987.72

Finding the Fourth Proportional to 7,921.24, 11,872.68 and 2,987.72

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Solution

The fourth proportional to 7,921.24, 11,872.68 and 2,987.72 is: 4,478.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,921.24 : 11,872.68 = 2,987.72 : x
  2. Step 2: Convert to fraction form
    7,921.24/11,872.68 = 2,987.72/x
  3. Step 3: Cross multiply
    7,921.24x = 11,872.68 × 2,987.72
  4. Step 4: Simplify right side
    7,921.24x = 35,472,243.49
  5. Step 5: Solve for x
    x = 35,472,243.49/7,921.24
  6. Step 6: Final answer
    x = 4,478.12

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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.