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Finding the Fourth Proportional to 13,297.79, 18,339.78 and 7,991.59

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Solution

The fourth proportional to 13,297.79, 18,339.78 and 7,991.59 is: 11,021.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,297.79 : 18,339.78 = 7,991.59 : x
  2. Step 2: Convert to fraction form
    13,297.79/18,339.78 = 7,991.59/x
  3. Step 3: Cross multiply
    13,297.79x = 18,339.78 × 7,991.59
  4. Step 4: Simplify right side
    13,297.79x = 146,563,910.75
  5. Step 5: Solve for x
    x = 146,563,910.75/13,297.79
  6. Step 6: Final answer
    x = 11,021.67

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Similar ratio
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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.