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Finding the Third Proportional to 31,428 and 68,394

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Solution

The third proportional to 31,428 and 68,394 is: 148,839.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,428 : 68,394 = 68,394 : x
  2. Step 2: Convert to fraction form
    31,428/68,394 = 68,394/x
  3. Step 3: Cross multiply
    31,428x = 68,394 × 68,394
  4. Step 4: Simplify right side
    31,428x = 4,677,739,236
  5. Step 5: Solve for x
    x = 4,677,739,236/31,428
  6. Step 6: Final answer
    x = 148,839.86

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Why These Related Problems?

These problems maintain the same ratio (2.18) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.