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Finding the Fourth Proportional to 138,074.44, 207,112.20 and 42,012.61

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Solution

The fourth proportional to 138,074.44, 207,112.20 and 42,012.61 is: 63,019.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,074.44 : 207,112.20 = 42,012.61 : x
  2. Step 2: Convert to fraction form
    138,074.44/207,112.20 = 42,012.61/x
  3. Step 3: Cross multiply
    138,074.44x = 207,112.20 × 42,012.61
  4. Step 4: Simplify right side
    138,074.44x = 8,701,324,084.84
  5. Step 5: Solve for x
    x = 8,701,324,084.84/138,074.44
  6. Step 6: Final answer
    x = 63,019.08

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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.