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Finding the Fourth Proportional to 100,508.88, 138,704.90 and 55,189.79

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Solution

The fourth proportional to 100,508.88, 138,704.90 and 55,189.79 is: 76,163.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,508.88 : 138,704.90 = 55,189.79 : x
  2. Step 2: Convert to fraction form
    100,508.88/138,704.90 = 55,189.79/x
  3. Step 3: Cross multiply
    100,508.88x = 138,704.90 × 55,189.79
  4. Step 4: Simplify right side
    100,508.88x = 7,655,093,333.50
  5. Step 5: Solve for x
    x = 7,655,093,333.50/100,508.88
  6. Step 6: Final answer
    x = 76,163.35

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1.5x scale

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.