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Finding the Fourth Proportional to 13,221.96, 18,249.50 and 8,980.10

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Solution

The fourth proportional to 13,221.96, 18,249.50 and 8,980.10 is: 12,394.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,221.96 : 18,249.50 = 8,980.10 : x
  2. Step 2: Convert to fraction form
    13,221.96/18,249.50 = 8,980.10/x
  3. Step 3: Cross multiply
    13,221.96x = 18,249.50 × 8,980.10
  4. Step 4: Simplify right side
    13,221.96x = 163,882,334.95
  5. Step 5: Solve for x
    x = 163,882,334.95/13,221.96
  6. Step 6: Final answer
    x = 12,394.71

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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.