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Finding the Fourth Proportional to 1,919.82, 2,878.38 and 748.92

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Solution

The fourth proportional to 1,919.82, 2,878.38 and 748.92 is: 1,122.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,919.82 : 2,878.38 = 748.92 : x
  2. Step 2: Convert to fraction form
    1,919.82/2,878.38 = 748.92/x
  3. Step 3: Cross multiply
    1,919.82x = 2,878.38 × 748.92
  4. Step 4: Simplify right side
    1,919.82x = 2,155,676.35
  5. Step 5: Solve for x
    x = 2,155,676.35/1,919.82
  6. Step 6: Final answer
    x = 1,122.85

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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.