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Finding the Third Proportional to 1,820 and 3,931

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Solution

The third proportional to 1,820 and 3,931 is: 8,490.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,820 : 3,931 = 3,931 : x
  2. Step 2: Convert to fraction form
    1,820/3,931 = 3,931/x
  3. Step 3: Cross multiply
    1,820x = 3,931 × 3,931
  4. Step 4: Simplify right side
    1,820x = 15,452,761
  5. Step 5: Solve for x
    x = 15,452,761/1,820
  6. Step 6: Final answer
    x = 8,490.53

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Why These Related Problems?

These problems maintain the same ratio (2.16) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.