Home / 13,131.79-18,121.86-7,163.44

Finding the Fourth Proportional to 13,131.79, 18,121.86 and 7,163.44

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Solution

The fourth proportional to 13,131.79, 18,121.86 and 7,163.44 is: 9,885.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,131.79 : 18,121.86 = 7,163.44 : x
  2. Step 2: Convert to fraction form
    13,131.79/18,121.86 = 7,163.44/x
  3. Step 3: Cross multiply
    13,131.79x = 18,121.86 × 7,163.44
  4. Step 4: Simplify right side
    13,131.79x = 129,814,811.49
  5. Step 5: Solve for x
    x = 129,814,811.49/13,131.79
  6. Step 6: Final answer
    x = 9,885.54

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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.