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Finding the Third Proportional to 19,778 and 31,306

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Solution

The third proportional to 19,778 and 31,306 is: 49,553.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,778 : 31,306 = 31,306 : x
  2. Step 2: Convert to fraction form
    19,778/31,306 = 31,306/x
  3. Step 3: Cross multiply
    19,778x = 31,306 × 31,306
  4. Step 4: Simplify right side
    19,778x = 980,065,636
  5. Step 5: Solve for x
    x = 980,065,636/19,778
  6. Step 6: Final answer
    x = 49,553.32

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Why These Related Problems?

These problems maintain the same ratio (1.58) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.