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Finding the Fourth Proportional to 20,872.39, 28,806.85 and 12,917.18

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Solution

The fourth proportional to 20,872.39, 28,806.85 and 12,917.18 is: 17,827.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,872.39 : 28,806.85 = 12,917.18 : x
  2. Step 2: Convert to fraction form
    20,872.39/28,806.85 = 12,917.18/x
  3. Step 3: Cross multiply
    20,872.39x = 28,806.85 × 12,917.18
  4. Step 4: Simplify right side
    20,872.39x = 372,103,058.06
  5. Step 5: Solve for x
    x = 372,103,058.06/20,872.39
  6. Step 6: Final answer
    x = 17,827.53

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1.5x scale

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.