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Finding the Third Proportional to 1,388 and 2,990

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Solution

The third proportional to 1,388 and 2,990 is: 6,440.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,388 : 2,990 = 2,990 : x
  2. Step 2: Convert to fraction form
    1,388/2,990 = 2,990/x
  3. Step 3: Cross multiply
    1,388x = 2,990 × 2,990
  4. Step 4: Simplify right side
    1,388x = 8,940,100
  5. Step 5: Solve for x
    x = 8,940,100/1,388
  6. Step 6: Final answer
    x = 6,440.99

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Why These Related Problems?

These problems maintain the same ratio (2.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.