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Finding the Fourth Proportional to 138,661.89, 207,992.80 and 45,167.64

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Solution

The fourth proportional to 138,661.89, 207,992.80 and 45,167.64 is: 67,751.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,661.89 : 207,992.80 = 45,167.64 : x
  2. Step 2: Convert to fraction form
    138,661.89/207,992.80 = 45,167.64/x
  3. Step 3: Cross multiply
    138,661.89x = 207,992.80 × 45,167.64
  4. Step 4: Simplify right side
    138,661.89x = 9,394,543,912.99
  5. Step 5: Solve for x
    x = 9,394,543,912.99/138,661.89
  6. Step 6: Final answer
    x = 67,751.45

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1.5x scale

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.