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Finding the Fourth Proportional to 1,916.62, 2,872.75 and 863.29

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Solution

The fourth proportional to 1,916.62, 2,872.75 and 863.29 is: 1,293.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,916.62 : 2,872.75 = 863.29 : x
  2. Step 2: Convert to fraction form
    1,916.62/2,872.75 = 863.29/x
  3. Step 3: Cross multiply
    1,916.62x = 2,872.75 × 863.29
  4. Step 4: Simplify right side
    1,916.62x = 2,480,028.77
  5. Step 5: Solve for x
    x = 2,480,028.77/1,916.62
  6. Step 6: Final answer
    x = 1,293.96

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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.