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Finding the Fourth Proportional to 15,885.64, 21,921.19 and 8,811.91

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Solution

The fourth proportional to 15,885.64, 21,921.19 and 8,811.91 is: 12,159.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,885.64 : 21,921.19 = 8,811.91 : x
  2. Step 2: Convert to fraction form
    15,885.64/21,921.19 = 8,811.91/x
  3. Step 3: Cross multiply
    15,885.64x = 21,921.19 × 8,811.91
  4. Step 4: Simplify right side
    15,885.64x = 193,167,553.37
  5. Step 5: Solve for x
    x = 193,167,553.37/15,885.64
  6. Step 6: Final answer
    x = 12,159.88

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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.