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Finding the Fourth Proportional to 137,627.70, 206,571.15 and 85,139.70

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Solution

The fourth proportional to 137,627.70, 206,571.15 and 85,139.70 is: 127,789.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    137,627.70 : 206,571.15 = 85,139.70 : x
  2. Step 2: Convert to fraction form
    137,627.70/206,571.15 = 85,139.70/x
  3. Step 3: Cross multiply
    137,627.70x = 206,571.15 × 85,139.70
  4. Step 4: Simplify right side
    137,627.70x = 17,587,405,739.66
  5. Step 5: Solve for x
    x = 17,587,405,739.66/137,627.70
  6. Step 6: Final answer
    x = 127,789.72

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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.