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Finding the Fourth Proportional to 13,339.22, 18,408.48 and 7,964.78

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Solution

The fourth proportional to 13,339.22, 18,408.48 and 7,964.78 is: 10,991.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,339.22 : 18,408.48 = 7,964.78 : x
  2. Step 2: Convert to fraction form
    13,339.22/18,408.48 = 7,964.78/x
  3. Step 3: Cross multiply
    13,339.22x = 18,408.48 × 7,964.78
  4. Step 4: Simplify right side
    13,339.22x = 146,619,493.33
  5. Step 5: Solve for x
    x = 146,619,493.33/13,339.22
  6. Step 6: Final answer
    x = 10,991.61

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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.