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Finding the Fourth Proportional to 1,916.31, 2,874.56 and 819.57

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Solution

The fourth proportional to 1,916.31, 2,874.56 and 819.57 is: 1,229.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,916.31 : 2,874.56 = 819.57 : x
  2. Step 2: Convert to fraction form
    1,916.31/2,874.56 = 819.57/x
  3. Step 3: Cross multiply
    1,916.31x = 2,874.56 × 819.57
  4. Step 4: Simplify right side
    1,916.31x = 2,355,903.14
  5. Step 5: Solve for x
    x = 2,355,903.14/1,916.31
  6. Step 6: Final answer
    x = 1,229.40

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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.