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Finding the Fourth Proportional to 100,679.70, 138,938.51 and 55,360.61

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Solution

The fourth proportional to 100,679.70, 138,938.51 and 55,360.61 is: 76,397.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,679.70 : 138,938.51 = 55,360.61 : x
  2. Step 2: Convert to fraction form
    100,679.70/138,938.51 = 55,360.61/x
  3. Step 3: Cross multiply
    100,679.70x = 138,938.51 × 55,360.61
  4. Step 4: Simplify right side
    100,679.70x = 7,691,719,694.60
  5. Step 5: Solve for x
    x = 7,691,719,694.60/100,679.70
  6. Step 6: Final answer
    x = 76,397.92

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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.