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Finding the Fourth Proportional to 2,809.84, 4,213.24 and 861.52

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Solution

The fourth proportional to 2,809.84, 4,213.24 and 861.52 is: 1,291.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,809.84 : 4,213.24 = 861.52 : x
  2. Step 2: Convert to fraction form
    2,809.84/4,213.24 = 861.52/x
  3. Step 3: Cross multiply
    2,809.84x = 4,213.24 × 861.52
  4. Step 4: Simplify right side
    2,809.84x = 3,629,790.52
  5. Step 5: Solve for x
    x = 3,629,790.52/2,809.84
  6. Step 6: Final answer
    x = 1,291.81

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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.