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Finding the Fourth Proportional to 1,920.78, 2,878.90 and 1,099.62

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Solution

The fourth proportional to 1,920.78, 2,878.90 and 1,099.62 is: 1,648.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,920.78 : 2,878.90 = 1,099.62 : x
  2. Step 2: Convert to fraction form
    1,920.78/2,878.90 = 1,099.62/x
  3. Step 3: Cross multiply
    1,920.78x = 2,878.90 × 1,099.62
  4. Step 4: Simplify right side
    1,920.78x = 3,165,693.27
  5. Step 5: Solve for x
    x = 3,165,693.27/1,920.78
  6. Step 6: Final answer
    x = 1,648.13

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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.