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Finding the Fourth Proportional to 16,689.43, 25,040.49 and 7,809.81

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Solution

The fourth proportional to 16,689.43, 25,040.49 and 7,809.81 is: 11,717.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    16,689.43 : 25,040.49 = 7,809.81 : x
  2. Step 2: Convert to fraction form
    16,689.43/25,040.49 = 7,809.81/x
  3. Step 3: Cross multiply
    16,689.43x = 25,040.49 × 7,809.81
  4. Step 4: Simplify right side
    16,689.43x = 195,561,469.21
  5. Step 5: Solve for x
    x = 195,561,469.21/16,689.43
  6. Step 6: Final answer
    x = 11,717.68

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.