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Finding the Fourth Proportional to 15,681.82, 21,640.83 and 8,608.09

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Solution

The fourth proportional to 15,681.82, 21,640.83 and 8,608.09 is: 11,879.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,681.82 : 21,640.83 = 8,608.09 : x
  2. Step 2: Convert to fraction form
    15,681.82/21,640.83 = 8,608.09/x
  3. Step 3: Cross multiply
    15,681.82x = 21,640.83 × 8,608.09
  4. Step 4: Simplify right side
    15,681.82x = 186,286,212.31
  5. Step 5: Solve for x
    x = 186,286,212.31/15,681.82
  6. Step 6: Final answer
    x = 11,879.12

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1.5x scale

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.