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Finding the Fourth Proportional to 137,921.79, 206,735.67 and 78,629.79

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Solution

The fourth proportional to 137,921.79, 206,735.67 and 78,629.79 is: 117,860.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    137,921.79 : 206,735.67 = 78,629.79 : x
  2. Step 2: Convert to fraction form
    137,921.79/206,735.67 = 78,629.79/x
  3. Step 3: Cross multiply
    137,921.79x = 206,735.67 × 78,629.79
  4. Step 4: Simplify right side
    137,921.79x = 16,255,582,317.61
  5. Step 5: Solve for x
    x = 16,255,582,317.61/137,921.79
  6. Step 6: Final answer
    x = 117,860.87

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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.