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Finding the Fourth Proportional to 15,763.22, 21,753.41 and 8,689.89

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Solution

The fourth proportional to 15,763.22, 21,753.41 and 8,689.89 is: 11,992.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,763.22 : 21,753.41 = 8,689.89 : x
  2. Step 2: Convert to fraction form
    15,763.22/21,753.41 = 8,689.89/x
  3. Step 3: Cross multiply
    15,763.22x = 21,753.41 × 8,689.89
  4. Step 4: Simplify right side
    15,763.22x = 189,034,696.58
  5. Step 5: Solve for x
    x = 189,034,696.58/15,763.22
  6. Step 6: Final answer
    x = 11,992.14

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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.