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Finding the Third Proportional to 1,247 and 1,388

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Solution

The third proportional to 1,247 and 1,388 is: 1,544.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,247 : 1,388 = 1,388 : x
  2. Step 2: Convert to fraction form
    1,247/1,388 = 1,388/x
  3. Step 3: Cross multiply
    1,247x = 1,388 × 1,388
  4. Step 4: Simplify right side
    1,247x = 1,926,544
  5. Step 5: Solve for x
    x = 1,926,544/1,247
  6. Step 6: Final answer
    x = 1,544.94

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Why These Related Problems?

These problems maintain the same ratio (1.11) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.