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Finding the Fourth Proportional to 138,611.40, 207,917.10 and 49,867.80

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Solution

The fourth proportional to 138,611.40, 207,917.10 and 49,867.80 is: 74,801.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,611.40 : 207,917.10 = 49,867.80 : x
  2. Step 2: Convert to fraction form
    138,611.40/207,917.10 = 49,867.80/x
  3. Step 3: Cross multiply
    138,611.40x = 207,917.10 × 49,867.80
  4. Step 4: Simplify right side
    138,611.40x = 10,368,368,359.38
  5. Step 5: Solve for x
    x = 10,368,368,359.38/138,611.40
  6. Step 6: Final answer
    x = 74,801.70

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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.