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Finding the Third Proportional to 1,916.50 and 3,911

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Solution

The third proportional to 1,916.50 and 3,911 is: 7,981.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,916.50 : 3,911 = 3,911 : x
  2. Step 2: Convert to fraction form
    1,916.50/3,911 = 3,911/x
  3. Step 3: Cross multiply
    1,916.50x = 3,911 × 3,911
  4. Step 4: Simplify right side
    1,916.50x = 15,295,921
  5. Step 5: Solve for x
    x = 15,295,921/1,916.50
  6. Step 6: Final answer
    x = 7,981.17

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Why These Related Problems?

These problems maintain the same ratio (2.04) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.