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Finding the Third Proportional to 20,618 and 31,119

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Solution

The third proportional to 20,618 and 31,119 is: 46,968.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,618 : 31,119 = 31,119 : x
  2. Step 2: Convert to fraction form
    20,618/31,119 = 31,119/x
  3. Step 3: Cross multiply
    20,618x = 31,119 × 31,119
  4. Step 4: Simplify right side
    20,618x = 968,392,161
  5. Step 5: Solve for x
    x = 968,392,161/20,618
  6. Step 6: Final answer
    x = 46,968.29

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.