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Finding the Fourth Proportional to 17,145.30, 25,705.80 and 7,789.80

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Solution

The fourth proportional to 17,145.30, 25,705.80 and 7,789.80 is: 11,679.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    17,145.30 : 25,705.80 = 7,789.80 : x
  2. Step 2: Convert to fraction form
    17,145.30/25,705.80 = 7,789.80/x
  3. Step 3: Cross multiply
    17,145.30x = 25,705.80 × 7,789.80
  4. Step 4: Simplify right side
    17,145.30x = 200,243,040.84
  5. Step 5: Solve for x
    x = 200,243,040.84/17,145.30
  6. Step 6: Final answer
    x = 11,679.18

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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.