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Finding the Fourth Proportional to 15,891.12, 21,929.94 and 8,818.20

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Solution

The fourth proportional to 15,891.12, 21,929.94 and 8,818.20 is: 12,169.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,891.12 : 21,929.94 = 8,818.20 : x
  2. Step 2: Convert to fraction form
    15,891.12/21,929.94 = 8,818.20/x
  3. Step 3: Cross multiply
    15,891.12x = 21,929.94 × 8,818.20
  4. Step 4: Simplify right side
    15,891.12x = 193,382,596.91
  5. Step 5: Solve for x
    x = 193,382,596.91/15,891.12
  6. Step 6: Final answer
    x = 12,169.22

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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.