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Finding the Fourth Proportional to 15,085.88, 20,818.99 and 8,372

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Solution

The fourth proportional to 15,085.88, 20,818.99 and 8,372 is: 11,553.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,085.88 : 20,818.99 = 8,372 : x
  2. Step 2: Convert to fraction form
    15,085.88/20,818.99 = 8,372/x
  3. Step 3: Cross multiply
    15,085.88x = 20,818.99 × 8,372
  4. Step 4: Simplify right side
    15,085.88x = 174,296,584.28
  5. Step 5: Solve for x
    x = 174,296,584.28/15,085.88
  6. Step 6: Final answer
    x = 11,553.62

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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.