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Finding the Third Proportional to 1,318 and 1,940

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Solution

The third proportional to 1,318 and 1,940 is: 2,855.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,318 : 1,940 = 1,940 : x
  2. Step 2: Convert to fraction form
    1,318/1,940 = 1,940/x
  3. Step 3: Cross multiply
    1,318x = 1,940 × 1,940
  4. Step 4: Simplify right side
    1,318x = 3,763,600
  5. Step 5: Solve for x
    x = 3,763,600/1,318
  6. Step 6: Final answer
    x = 2,855.54

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Why These Related Problems?

These problems maintain the same ratio (1.47) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.