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Finding the Third Proportional to 728 and 1,388

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Solution

The third proportional to 728 and 1,388 is: 2,646.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    728 : 1,388 = 1,388 : x
  2. Step 2: Convert to fraction form
    728/1,388 = 1,388/x
  3. Step 3: Cross multiply
    728x = 1,388 × 1,388
  4. Step 4: Simplify right side
    728x = 1,926,544
  5. Step 5: Solve for x
    x = 1,926,544/728
  6. Step 6: Final answer
    x = 2,646.35

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Why These Related Problems?

These problems maintain the same ratio (1.91) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.