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Finding the Fourth Proportional to 13,408.80, 18,504.95 and 7,744.58

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Solution

The fourth proportional to 13,408.80, 18,504.95 and 7,744.58 is: 10,687.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,408.80 : 18,504.95 = 7,744.58 : x
  2. Step 2: Convert to fraction form
    13,408.80/18,504.95 = 7,744.58/x
  3. Step 3: Cross multiply
    13,408.80x = 18,504.95 × 7,744.58
  4. Step 4: Simplify right side
    13,408.80x = 143,313,065.67
  5. Step 5: Solve for x
    x = 143,313,065.67/13,408.80
  6. Step 6: Final answer
    x = 10,687.99

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.