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Finding the Third Proportional to 2,157 and 2,820

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Solution

The third proportional to 2,157 and 2,820 is: 3,686.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,157 : 2,820 = 2,820 : x
  2. Step 2: Convert to fraction form
    2,157/2,820 = 2,820/x
  3. Step 3: Cross multiply
    2,157x = 2,820 × 2,820
  4. Step 4: Simplify right side
    2,157x = 7,952,400
  5. Step 5: Solve for x
    x = 7,952,400/2,157
  6. Step 6: Final answer
    x = 3,686.79

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Why These Related Problems?

These problems maintain the same ratio (1.31) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.