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Finding the Fourth Proportional to 15,865.33, 21,894.29 and 8,791.87

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Solution

The fourth proportional to 15,865.33, 21,894.29 and 8,791.87 is: 12,132.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,865.33 : 21,894.29 = 8,791.87 : x
  2. Step 2: Convert to fraction form
    15,865.33/21,894.29 = 8,791.87/x
  3. Step 3: Cross multiply
    15,865.33x = 21,894.29 × 8,791.87
  4. Step 4: Simplify right side
    15,865.33x = 192,491,707.46
  5. Step 5: Solve for x
    x = 192,491,707.46/15,865.33
  6. Step 6: Final answer
    x = 12,132.85

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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.