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Finding the Fourth Proportional to 100,604.81, 138,836.94 and 55,279.96

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Solution

The fourth proportional to 100,604.81, 138,836.94 and 55,279.96 is: 76,287.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,604.81 : 138,836.94 = 55,279.96 : x
  2. Step 2: Convert to fraction form
    100,604.81/138,836.94 = 55,279.96/x
  3. Step 3: Cross multiply
    100,604.81x = 138,836.94 × 55,279.96
  4. Step 4: Simplify right side
    100,604.81x = 7,674,900,489.72
  5. Step 5: Solve for x
    x = 7,674,900,489.72/100,604.81
  6. Step 6: Final answer
    x = 76,287.61

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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.