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Finding the Third Proportional to 790 and 1,742

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Solution

The third proportional to 790 and 1,742 is: 3,841.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    790 : 1,742 = 1,742 : x
  2. Step 2: Convert to fraction form
    790/1,742 = 1,742/x
  3. Step 3: Cross multiply
    790x = 1,742 × 1,742
  4. Step 4: Simplify right side
    790x = 3,034,564
  5. Step 5: Solve for x
    x = 3,034,564/790
  6. Step 6: Final answer
    x = 3,841.22

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Why These Related Problems?

These problems maintain the same ratio (2.21) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.