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Finding the Fourth Proportional to 15,681.44, 21,640.32 and 8,608

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Solution

The fourth proportional to 15,681.44, 21,640.32 and 8,608 is: 11,879.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,681.44 : 21,640.32 = 8,608 : x
  2. Step 2: Convert to fraction form
    15,681.44/21,640.32 = 8,608/x
  3. Step 3: Cross multiply
    15,681.44x = 21,640.32 × 8,608
  4. Step 4: Simplify right side
    15,681.44x = 186,279,874.56
  5. Step 5: Solve for x
    x = 186,279,874.56/15,681.44
  6. Step 6: Final answer
    x = 11,879.00

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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.