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Finding the Fourth Proportional to 99,540.84, 137,361.60 and 54,218.61

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Solution

The fourth proportional to 99,540.84, 137,361.60 and 54,218.61 is: 74,819.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,540.84 : 137,361.60 = 54,218.61 : x
  2. Step 2: Convert to fraction form
    99,540.84/137,361.60 = 54,218.61/x
  3. Step 3: Cross multiply
    99,540.84x = 137,361.60 × 54,218.61
  4. Step 4: Simplify right side
    99,540.84x = 7,447,555,019.38
  5. Step 5: Solve for x
    x = 7,447,555,019.38/99,540.84
  6. Step 6: Final answer
    x = 74,819.09

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.