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Finding the Fourth Proportional to 138,630.33, 207,923.81 and 45,135.45

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Solution

The fourth proportional to 138,630.33, 207,923.81 and 45,135.45 is: 67,696.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,630.33 : 207,923.81 = 45,135.45 : x
  2. Step 2: Convert to fraction form
    138,630.33/207,923.81 = 45,135.45/x
  3. Step 3: Cross multiply
    138,630.33x = 207,923.81 × 45,135.45
  4. Step 4: Simplify right side
    138,630.33x = 9,384,734,504.39
  5. Step 5: Solve for x
    x = 9,384,734,504.39/138,630.33
  6. Step 6: Final answer
    x = 67,696.11

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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.