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Finding the Fourth Proportional to 1,909.22, 2,863.55 and 812.75

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Solution

The fourth proportional to 1,909.22, 2,863.55 and 812.75 is: 1,219.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,909.22 : 2,863.55 = 812.75 : x
  2. Step 2: Convert to fraction form
    1,909.22/2,863.55 = 812.75/x
  3. Step 3: Cross multiply
    1,909.22x = 2,863.55 × 812.75
  4. Step 4: Simplify right side
    1,909.22x = 2,327,337.98
  5. Step 5: Solve for x
    x = 2,327,337.98/1,909.22
  6. Step 6: Final answer
    x = 1,219.00

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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.