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Finding the Fourth Proportional to 20,872.46, 28,805.48 and 12,919.28

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Solution

The fourth proportional to 20,872.46, 28,805.48 and 12,919.28 is: 17,829.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,872.46 : 28,805.48 = 12,919.28 : x
  2. Step 2: Convert to fraction form
    20,872.46/28,805.48 = 12,919.28/x
  3. Step 3: Cross multiply
    20,872.46x = 28,805.48 × 12,919.28
  4. Step 4: Simplify right side
    20,872.46x = 372,145,853.03
  5. Step 5: Solve for x
    x = 372,145,853.03/20,872.46
  6. Step 6: Final answer
    x = 17,829.52

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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.