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Finding the Fourth Proportional to 138,797.57, 208,273.34 and 67,720.79

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Solution

The fourth proportional to 138,797.57, 208,273.34 and 67,720.79 is: 101,618.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,797.57 : 208,273.34 = 67,720.79 : x
  2. Step 2: Convert to fraction form
    138,797.57/208,273.34 = 67,720.79/x
  3. Step 3: Cross multiply
    138,797.57x = 208,273.34 × 67,720.79
  4. Step 4: Simplify right side
    138,797.57x = 14,104,435,810.72
  5. Step 5: Solve for x
    x = 14,104,435,810.72/138,797.57
  6. Step 6: Final answer
    x = 101,618.75

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.