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Finding the Fourth Proportional to 2,890.69, 3,990.87 and 2,190.85

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Solution

The fourth proportional to 2,890.69, 3,990.87 and 2,190.85 is: 3,024.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,890.69 : 3,990.87 = 2,190.85 : x
  2. Step 2: Convert to fraction form
    2,890.69/3,990.87 = 2,190.85/x
  3. Step 3: Cross multiply
    2,890.69x = 3,990.87 × 2,190.85
  4. Step 4: Simplify right side
    2,890.69x = 8,743,387.56
  5. Step 5: Solve for x
    x = 8,743,387.56/2,890.69
  6. Step 6: Final answer
    x = 3,024.67

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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.