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Finding the Third Proportional to 12,420 and 17,091

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Solution

The third proportional to 12,420 and 17,091 is: 23,518.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,420 : 17,091 = 17,091 : x
  2. Step 2: Convert to fraction form
    12,420/17,091 = 17,091/x
  3. Step 3: Cross multiply
    12,420x = 17,091 × 17,091
  4. Step 4: Simplify right side
    12,420x = 292,102,281
  5. Step 5: Solve for x
    x = 292,102,281/12,420
  6. Step 6: Final answer
    x = 23,518.70

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.