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Finding the Fourth Proportional to 17,908.65, 26,863.20 and 5,428.80

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Solution

The fourth proportional to 17,908.65, 26,863.20 and 5,428.80 is: 8,143.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    17,908.65 : 26,863.20 = 5,428.80 : x
  2. Step 2: Convert to fraction form
    17,908.65/26,863.20 = 5,428.80/x
  3. Step 3: Cross multiply
    17,908.65x = 26,863.20 × 5,428.80
  4. Step 4: Simplify right side
    17,908.65x = 145,834,940.16
  5. Step 5: Solve for x
    x = 145,834,940.16/17,908.65
  6. Step 6: Final answer
    x = 8,143.27

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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.