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Finding the Third Proportional to 60,420 and 128,889

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Solution

The third proportional to 60,420 and 128,889 is: 274,948.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    60,420 : 128,889 = 128,889 : x
  2. Step 2: Convert to fraction form
    60,420/128,889 = 128,889/x
  3. Step 3: Cross multiply
    60,420x = 128,889 × 128,889
  4. Step 4: Simplify right side
    60,420x = 16,612,374,321
  5. Step 5: Solve for x
    x = 16,612,374,321/60,420
  6. Step 6: Final answer
    x = 274,948.27

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Why These Related Problems?

These problems maintain the same ratio (2.13) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.