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Finding the Fourth Proportional to 8,689.68, 13,034.52 and 2,115.82

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Solution

The fourth proportional to 8,689.68, 13,034.52 and 2,115.82 is: 3,173.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,689.68 : 13,034.52 = 2,115.82 : x
  2. Step 2: Convert to fraction form
    8,689.68/13,034.52 = 2,115.82/x
  3. Step 3: Cross multiply
    8,689.68x = 13,034.52 × 2,115.82
  4. Step 4: Simplify right side
    8,689.68x = 27,578,714.40
  5. Step 5: Solve for x
    x = 27,578,714.40/8,689.68
  6. Step 6: Final answer
    x = 3,173.73

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.