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Finding the Fourth Proportional to 100,679.94, 138,938.85 and 55,360.85

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Solution

The fourth proportional to 100,679.94, 138,938.85 and 55,360.85 is: 76,398.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,679.94 : 138,938.85 = 55,360.85 : x
  2. Step 2: Convert to fraction form
    100,679.94/138,938.85 = 55,360.85/x
  3. Step 3: Cross multiply
    100,679.94x = 138,938.85 × 55,360.85
  4. Step 4: Simplify right side
    100,679.94x = 7,691,772,834.02
  5. Step 5: Solve for x
    x = 7,691,772,834.02/100,679.94
  6. Step 6: Final answer
    x = 76,398.27

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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.