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Finding the Fourth Proportional to 43,991.90, 65,974.78 and 12,399.67

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Solution

The fourth proportional to 43,991.90, 65,974.78 and 12,399.67 is: 18,595.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    43,991.90 : 65,974.78 = 12,399.67 : x
  2. Step 2: Convert to fraction form
    43,991.90/65,974.78 = 12,399.67/x
  3. Step 3: Cross multiply
    43,991.90x = 65,974.78 × 12,399.67
  4. Step 4: Simplify right side
    43,991.90x = 818,065,500.32
  5. Step 5: Solve for x
    x = 818,065,500.32/43,991.90
  6. Step 6: Final answer
    x = 18,595.82

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.