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Finding the Fourth Proportional to 2,125.80, 3,188.73 and 809.57

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Solution

The fourth proportional to 2,125.80, 3,188.73 and 809.57 is: 1,214.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,125.80 : 3,188.73 = 809.57 : x
  2. Step 2: Convert to fraction form
    2,125.80/3,188.73 = 809.57/x
  3. Step 3: Cross multiply
    2,125.80x = 3,188.73 × 809.57
  4. Step 4: Simplify right side
    2,125.80x = 2,581,500.15
  5. Step 5: Solve for x
    x = 2,581,500.15/2,125.80
  6. Step 6: Final answer
    x = 1,214.37

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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.