Home / 7,919.36-11,871.12-2,721.68

Finding the Fourth Proportional to 7,919.36, 11,871.12 and 2,721.68

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Solution

The fourth proportional to 7,919.36, 11,871.12 and 2,721.68 is: 4,079.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,919.36 : 11,871.12 = 2,721.68 : x
  2. Step 2: Convert to fraction form
    7,919.36/11,871.12 = 2,721.68/x
  3. Step 3: Cross multiply
    7,919.36x = 11,871.12 × 2,721.68
  4. Step 4: Simplify right side
    7,919.36x = 32,309,389.88
  5. Step 5: Solve for x
    x = 32,309,389.88/7,919.36
  6. Step 6: Final answer
    x = 4,079.80

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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.