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Finding the Third Proportional to 1,215 and 1,820

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Solution

The third proportional to 1,215 and 1,820 is: 2,726.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,215 : 1,820 = 1,820 : x
  2. Step 2: Convert to fraction form
    1,215/1,820 = 1,820/x
  3. Step 3: Cross multiply
    1,215x = 1,820 × 1,820
  4. Step 4: Simplify right side
    1,215x = 3,312,400
  5. Step 5: Solve for x
    x = 3,312,400/1,215
  6. Step 6: Final answer
    x = 2,726.26

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.