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Finding the Third Proportional to 2,856 and 7,420

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Solution

The third proportional to 2,856 and 7,420 is: 19,277.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,856 : 7,420 = 7,420 : x
  2. Step 2: Convert to fraction form
    2,856/7,420 = 7,420/x
  3. Step 3: Cross multiply
    2,856x = 7,420 × 7,420
  4. Step 4: Simplify right side
    2,856x = 55,056,400
  5. Step 5: Solve for x
    x = 55,056,400/2,856
  6. Step 6: Final answer
    x = 19,277.45

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Why These Related Problems?

These problems maintain the same ratio (2.60) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.