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Finding the Third Proportional to 1,405 and 1,555

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Solution

The third proportional to 1,405 and 1,555 is: 1,721.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,405 : 1,555 = 1,555 : x
  2. Step 2: Convert to fraction form
    1,405/1,555 = 1,555/x
  3. Step 3: Cross multiply
    1,405x = 1,555 × 1,555
  4. Step 4: Simplify right side
    1,405x = 2,418,025
  5. Step 5: Solve for x
    x = 2,418,025/1,405
  6. Step 6: Final answer
    x = 1,721.01

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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.