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Finding the Fourth Proportional to 15,891.66, 21,930.85 and 8,818.54

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Solution

The fourth proportional to 15,891.66, 21,930.85 and 8,818.54 is: 12,169.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,891.66 : 21,930.85 = 8,818.54 : x
  2. Step 2: Convert to fraction form
    15,891.66/21,930.85 = 8,818.54/x
  3. Step 3: Cross multiply
    15,891.66x = 21,930.85 × 8,818.54
  4. Step 4: Simplify right side
    15,891.66x = 193,398,034.16
  5. Step 5: Solve for x
    x = 193,398,034.16/15,891.66
  6. Step 6: Final answer
    x = 12,169.78

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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.