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Finding the Fourth Proportional to 15,863.51, 21,892.43 and 8,789.96

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Solution

The fourth proportional to 15,863.51, 21,892.43 and 8,789.96 is: 12,130.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,863.51 : 21,892.43 = 8,789.96 : x
  2. Step 2: Convert to fraction form
    15,863.51/21,892.43 = 8,789.96/x
  3. Step 3: Cross multiply
    15,863.51x = 21,892.43 × 8,789.96
  4. Step 4: Simplify right side
    15,863.51x = 192,433,584.00
  5. Step 5: Solve for x
    x = 192,433,584.00/15,863.51
  6. Step 6: Final answer
    x = 12,130.58

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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.