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Finding the Third Proportional to 1,390 and 3,359

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Solution

The third proportional to 1,390 and 3,359 is: 8,117.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,390 : 3,359 = 3,359 : x
  2. Step 2: Convert to fraction form
    1,390/3,359 = 3,359/x
  3. Step 3: Cross multiply
    1,390x = 3,359 × 3,359
  4. Step 4: Simplify right side
    1,390x = 11,282,881
  5. Step 5: Solve for x
    x = 11,282,881/1,390
  6. Step 6: Final answer
    x = 8,117.18

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Why These Related Problems?

These problems maintain the same ratio (2.42) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.