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Finding the Third Proportional to 2,780 and 4,742

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Solution

The third proportional to 2,780 and 4,742 is: 8,088.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,780 : 4,742 = 4,742 : x
  2. Step 2: Convert to fraction form
    2,780/4,742 = 4,742/x
  3. Step 3: Cross multiply
    2,780x = 4,742 × 4,742
  4. Step 4: Simplify right side
    2,780x = 22,486,564
  5. Step 5: Solve for x
    x = 22,486,564/2,780
  6. Step 6: Final answer
    x = 8,088.69

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Why These Related Problems?

These problems maintain the same ratio (1.71) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.