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Finding the Fourth Proportional to 15,884.68, 21,921.90 and 8,811.88

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Solution

The fourth proportional to 15,884.68, 21,921.90 and 8,811.88 is: 12,160.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,884.68 : 21,921.90 = 8,811.88 : x
  2. Step 2: Convert to fraction form
    15,884.68/21,921.90 = 8,811.88/x
  3. Step 3: Cross multiply
    15,884.68x = 21,921.90 × 8,811.88
  4. Step 4: Simplify right side
    15,884.68x = 193,173,152.17
  5. Step 5: Solve for x
    x = 193,173,152.17/15,884.68
  6. Step 6: Final answer
    x = 12,160.97

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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.