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Finding the Fourth Proportional to 26,020.80, 39,040.80 and 8,491.20

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Solution

The fourth proportional to 26,020.80, 39,040.80 and 8,491.20 is: 12,739.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    26,020.80 : 39,040.80 = 8,491.20 : x
  2. Step 2: Convert to fraction form
    26,020.80/39,040.80 = 8,491.20/x
  3. Step 3: Cross multiply
    26,020.80x = 39,040.80 × 8,491.20
  4. Step 4: Simplify right side
    26,020.80x = 331,503,240.96
  5. Step 5: Solve for x
    x = 331,503,240.96/26,020.80
  6. Step 6: Final answer
    x = 12,739.93

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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.