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Finding the Fourth Proportional to 15,855.92, 21,880.20 and 8,781.92

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Solution

The fourth proportional to 15,855.92, 21,880.20 and 8,781.92 is: 12,118.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,855.92 : 21,880.20 = 8,781.92 : x
  2. Step 2: Convert to fraction form
    15,855.92/21,880.20 = 8,781.92/x
  3. Step 3: Cross multiply
    15,855.92x = 21,880.20 × 8,781.92
  4. Step 4: Simplify right side
    15,855.92x = 192,150,165.98
  5. Step 5: Solve for x
    x = 192,150,165.98/15,855.92
  6. Step 6: Final answer
    x = 12,118.51

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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.