Home / 13,131.21-18,121.29-7,162.88

Finding the Fourth Proportional to 13,131.21, 18,121.29 and 7,162.88

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Solution

The fourth proportional to 13,131.21, 18,121.29 and 7,162.88 is: 9,884.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,131.21 : 18,121.29 = 7,162.88 : x
  2. Step 2: Convert to fraction form
    13,131.21/18,121.29 = 7,162.88/x
  3. Step 3: Cross multiply
    13,131.21x = 18,121.29 × 7,162.88
  4. Step 4: Simplify right side
    13,131.21x = 129,800,610.18
  5. Step 5: Solve for x
    x = 129,800,610.18/13,131.21
  6. Step 6: Final answer
    x = 9,884.89

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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.