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Finding the Fourth Proportional to 15,889.97, 21,929.19 and 8,816.41

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Solution

The fourth proportional to 15,889.97, 21,929.19 and 8,816.41 is: 12,167.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,889.97 : 21,929.19 = 8,816.41 : x
  2. Step 2: Convert to fraction form
    15,889.97/21,929.19 = 8,816.41/x
  3. Step 3: Cross multiply
    15,889.97x = 21,929.19 × 8,816.41
  4. Step 4: Simplify right side
    15,889.97x = 193,336,730.01
  5. Step 5: Solve for x
    x = 193,336,730.01/15,889.97
  6. Step 6: Final answer
    x = 12,167.22

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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.