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Finding the Third Proportional to 1,266 and 1,390

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Solution

The third proportional to 1,266 and 1,390 is: 1,526.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,266 : 1,390 = 1,390 : x
  2. Step 2: Convert to fraction form
    1,266/1,390 = 1,390/x
  3. Step 3: Cross multiply
    1,266x = 1,390 × 1,390
  4. Step 4: Simplify right side
    1,266x = 1,932,100
  5. Step 5: Solve for x
    x = 1,932,100/1,266
  6. Step 6: Final answer
    x = 1,526.15

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Why These Related Problems?

These problems maintain the same ratio (1.10) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.