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Finding the Fourth Proportional to 15,694.98, 21,659.25 and 8,621.25

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Solution

The fourth proportional to 15,694.98, 21,659.25 and 8,621.25 is: 11,897.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,694.98 : 21,659.25 = 8,621.25 : x
  2. Step 2: Convert to fraction form
    15,694.98/21,659.25 = 8,621.25/x
  3. Step 3: Cross multiply
    15,694.98x = 21,659.25 × 8,621.25
  4. Step 4: Simplify right side
    15,694.98x = 186,729,809.06
  5. Step 5: Solve for x
    x = 186,729,809.06/15,694.98
  6. Step 6: Final answer
    x = 11,897.42

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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.