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Finding the Fourth Proportional to 2,861.50, 4,292.50 and 809.50

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Solution

The fourth proportional to 2,861.50, 4,292.50 and 809.50 is: 1,214.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,861.50 : 4,292.50 = 809.50 : x
  2. Step 2: Convert to fraction form
    2,861.50/4,292.50 = 809.50/x
  3. Step 3: Cross multiply
    2,861.50x = 4,292.50 × 809.50
  4. Step 4: Simplify right side
    2,861.50x = 3,474,778.75
  5. Step 5: Solve for x
    x = 3,474,778.75/2,861.50
  6. Step 6: Final answer
    x = 1,214.32

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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.