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Finding the Third Proportional to 1,391 and 3,290

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Solution

The third proportional to 1,391 and 3,290 is: 7,781.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,391 : 3,290 = 3,290 : x
  2. Step 2: Convert to fraction form
    1,391/3,290 = 3,290/x
  3. Step 3: Cross multiply
    1,391x = 3,290 × 3,290
  4. Step 4: Simplify right side
    1,391x = 10,824,100
  5. Step 5: Solve for x
    x = 10,824,100/1,391
  6. Step 6: Final answer
    x = 7,781.52

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Why These Related Problems?

These problems maintain the same ratio (2.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.