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Finding the Fourth Proportional to 2,861.60, 4,292.72 and 809.76

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Solution

The fourth proportional to 2,861.60, 4,292.72 and 809.76 is: 1,214.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,861.60 : 4,292.72 = 809.76 : x
  2. Step 2: Convert to fraction form
    2,861.60/4,292.72 = 809.76/x
  3. Step 3: Cross multiply
    2,861.60x = 4,292.72 × 809.76
  4. Step 4: Simplify right side
    2,861.60x = 3,476,072.95
  5. Step 5: Solve for x
    x = 3,476,072.95/2,861.60
  6. Step 6: Final answer
    x = 1,214.73

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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.