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Finding the Fourth Proportional to 1,909.22, 2,863.92 and 676.76

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Solution

The fourth proportional to 1,909.22, 2,863.92 and 676.76 is: 1,015.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,909.22 : 2,863.92 = 676.76 : x
  2. Step 2: Convert to fraction form
    1,909.22/2,863.92 = 676.76/x
  3. Step 3: Cross multiply
    1,909.22x = 2,863.92 × 676.76
  4. Step 4: Simplify right side
    1,909.22x = 1,938,174.72
  5. Step 5: Solve for x
    x = 1,938,174.72/1,909.22
  6. Step 6: Final answer
    x = 1,015.17

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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.