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Finding the Fourth Proportional to 12,647.88, 18,969.11 and 3,761.07

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Solution

The fourth proportional to 12,647.88, 18,969.11 and 3,761.07 is: 5,640.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,647.88 : 18,969.11 = 3,761.07 : x
  2. Step 2: Convert to fraction form
    12,647.88/18,969.11 = 3,761.07/x
  3. Step 3: Cross multiply
    12,647.88x = 18,969.11 × 3,761.07
  4. Step 4: Simplify right side
    12,647.88x = 71,344,131.74
  5. Step 5: Solve for x
    x = 71,344,131.74/12,647.88
  6. Step 6: Final answer
    x = 5,640.80

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1.5x scale

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.