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Finding the Third Proportional to 30,918 and 57,420

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Solution

The third proportional to 30,918 and 57,420 is: 106,638.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,918 : 57,420 = 57,420 : x
  2. Step 2: Convert to fraction form
    30,918/57,420 = 57,420/x
  3. Step 3: Cross multiply
    30,918x = 57,420 × 57,420
  4. Step 4: Simplify right side
    30,918x = 3,297,056,400
  5. Step 5: Solve for x
    x = 3,297,056,400/30,918
  6. Step 6: Final answer
    x = 106,638.73

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Why These Related Problems?

These problems maintain the same ratio (1.86) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.