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Finding the Fourth Proportional to 9,105, 13,553.25 and 8,680.20

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Solution

The fourth proportional to 9,105, 13,553.25 and 8,680.20 is: 12,920.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,105 : 13,553.25 = 8,680.20 : x
  2. Step 2: Convert to fraction form
    9,105/13,553.25 = 8,680.20/x
  3. Step 3: Cross multiply
    9,105x = 13,553.25 × 8,680.20
  4. Step 4: Simplify right side
    9,105x = 117,644,920.65
  5. Step 5: Solve for x
    x = 117,644,920.65/9,105
  6. Step 6: Final answer
    x = 12,920.91

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.