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Finding the Fourth Proportional to 138,396.84, 207,660.78 and 82,347.72

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Solution

The fourth proportional to 138,396.84, 207,660.78 and 82,347.72 is: 123,560.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,396.84 : 207,660.78 = 82,347.72 : x
  2. Step 2: Convert to fraction form
    138,396.84/207,660.78 = 82,347.72/x
  3. Step 3: Cross multiply
    138,396.84x = 207,660.78 × 82,347.72
  4. Step 4: Simplify right side
    138,396.84x = 17,100,391,766.42
  5. Step 5: Solve for x
    x = 17,100,391,766.42/138,396.84
  6. Step 6: Final answer
    x = 123,560.57

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.