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Finding the Fourth Proportional to 138,268, 207,406.86 and 79,076.44

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Solution

The fourth proportional to 138,268, 207,406.86 and 79,076.44 is: 118,617.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,268 : 207,406.86 = 79,076.44 : x
  2. Step 2: Convert to fraction form
    138,268/207,406.86 = 79,076.44/x
  3. Step 3: Cross multiply
    138,268x = 207,406.86 × 79,076.44
  4. Step 4: Simplify right side
    138,268x = 16,400,996,120.38
  5. Step 5: Solve for x
    x = 16,400,996,120.38/138,268
  6. Step 6: Final answer
    x = 118,617.44

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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.