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Finding the Fourth Proportional to 11,990.85, 18,012.19 and 10,145.67

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Solution

The fourth proportional to 11,990.85, 18,012.19 and 10,145.67 is: 15,240.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,990.85 : 18,012.19 = 10,145.67 : x
  2. Step 2: Convert to fraction form
    11,990.85/18,012.19 = 10,145.67/x
  3. Step 3: Cross multiply
    11,990.85x = 18,012.19 × 10,145.67
  4. Step 4: Simplify right side
    11,990.85x = 182,745,735.72
  5. Step 5: Solve for x
    x = 182,745,735.72/11,990.85
  6. Step 6: Final answer
    x = 15,240.43

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1.5x scale

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.