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Finding the Fourth Proportional to 15,685.44, 21,645.84 and 8,612

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Solution

The fourth proportional to 15,685.44, 21,645.84 and 8,612 is: 11,884.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,685.44 : 21,645.84 = 8,612 : x
  2. Step 2: Convert to fraction form
    15,685.44/21,645.84 = 8,612/x
  3. Step 3: Cross multiply
    15,685.44x = 21,645.84 × 8,612
  4. Step 4: Simplify right side
    15,685.44x = 186,413,974.08
  5. Step 5: Solve for x
    x = 186,413,974.08/15,685.44
  6. Step 6: Final answer
    x = 11,884.52

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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.