Home / 13,218.12-18,240.88-7,249.78

Finding the Fourth Proportional to 13,218.12, 18,240.88 and 7,249.78

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Solution

The fourth proportional to 13,218.12, 18,240.88 and 7,249.78 is: 10,004.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,218.12 : 18,240.88 = 7,249.78 : x
  2. Step 2: Convert to fraction form
    13,218.12/18,240.88 = 7,249.78/x
  3. Step 3: Cross multiply
    13,218.12x = 18,240.88 × 7,249.78
  4. Step 4: Simplify right side
    13,218.12x = 132,242,367.01
  5. Step 5: Solve for x
    x = 132,242,367.01/13,218.12
  6. Step 6: Final answer
    x = 10,004.63

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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.