Home / 138,619.80-207,929.70-128,122.20

Finding the Fourth Proportional to 138,619.80, 207,929.70 and 128,122.20

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Solution

The fourth proportional to 138,619.80, 207,929.70 and 128,122.20 is: 192,183.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,619.80 : 207,929.70 = 128,122.20 : x
  2. Step 2: Convert to fraction form
    138,619.80/207,929.70 = 128,122.20/x
  3. Step 3: Cross multiply
    138,619.80x = 207,929.70 × 128,122.20
  4. Step 4: Simplify right side
    138,619.80x = 26,640,410,609.34
  5. Step 5: Solve for x
    x = 26,640,410,609.34/138,619.80
  6. Step 6: Final answer
    x = 192,183.30

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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.