Home / 20,871.28-28,802.20-11,439.82

Finding the Fourth Proportional to 20,871.28, 28,802.20 and 11,439.82

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Solution

The fourth proportional to 20,871.28, 28,802.20 and 11,439.82 is: 15,786.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,871.28 : 28,802.20 = 11,439.82 : x
  2. Step 2: Convert to fraction form
    20,871.28/28,802.20 = 11,439.82/x
  3. Step 3: Cross multiply
    20,871.28x = 28,802.20 × 11,439.82
  4. Step 4: Simplify right side
    20,871.28x = 329,491,983.60
  5. Step 5: Solve for x
    x = 329,491,983.60/20,871.28
  6. Step 6: Final answer
    x = 15,786.86

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.