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Finding the Fourth Proportional to 1,916.40, 2,872.64 and 819.84

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Solution

The fourth proportional to 1,916.40, 2,872.64 and 819.84 is: 1,228.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,916.40 : 2,872.64 = 819.84 : x
  2. Step 2: Convert to fraction form
    1,916.40/2,872.64 = 819.84/x
  3. Step 3: Cross multiply
    1,916.40x = 2,872.64 × 819.84
  4. Step 4: Simplify right side
    1,916.40x = 2,355,105.18
  5. Step 5: Solve for x
    x = 2,355,105.18/1,916.40
  6. Step 6: Final answer
    x = 1,228.92

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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.