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Finding the Fourth Proportional to 20,817.28, 28,727.04 and 11,865.28

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Solution

The fourth proportional to 20,817.28, 28,727.04 and 11,865.28 is: 16,373.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,817.28 : 28,727.04 = 11,865.28 : x
  2. Step 2: Convert to fraction form
    20,817.28/28,727.04 = 11,865.28/x
  3. Step 3: Cross multiply
    20,817.28x = 28,727.04 × 11,865.28
  4. Step 4: Simplify right side
    20,817.28x = 340,854,373.17
  5. Step 5: Solve for x
    x = 340,854,373.17/20,817.28
  6. Step 6: Final answer
    x = 16,373.63

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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.