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Finding the Fourth Proportional to 1,916.87, 2,872.90 and 819.95

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Solution

The fourth proportional to 1,916.87, 2,872.90 and 819.95 is: 1,228.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,916.87 : 2,872.90 = 819.95 : x
  2. Step 2: Convert to fraction form
    1,916.87/2,872.90 = 819.95/x
  3. Step 3: Cross multiply
    1,916.87x = 2,872.90 × 819.95
  4. Step 4: Simplify right side
    1,916.87x = 2,355,619.99
  5. Step 5: Solve for x
    x = 2,355,619.99/1,916.87
  6. Step 6: Final answer
    x = 1,228.89

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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.