Home / 13,218.40-18,249.60-8,748.38

Finding the Fourth Proportional to 13,218.40, 18,249.60 and 8,748.38

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Solution

The fourth proportional to 13,218.40, 18,249.60 and 8,748.38 is: 12,078.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,218.40 : 18,249.60 = 8,748.38 : x
  2. Step 2: Convert to fraction form
    13,218.40/18,249.60 = 8,748.38/x
  3. Step 3: Cross multiply
    13,218.40x = 18,249.60 × 8,748.38
  4. Step 4: Simplify right side
    13,218.40x = 159,654,462.75
  5. Step 5: Solve for x
    x = 159,654,462.75/13,218.40
  6. Step 6: Final answer
    x = 12,078.20

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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.