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Finding the Fourth Proportional to 100,640.45, 150,960.57 and 25,760.47

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Solution

The fourth proportional to 100,640.45, 150,960.57 and 25,760.47 is: 38,640.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,640.45 : 150,960.57 = 25,760.47 : x
  2. Step 2: Convert to fraction form
    100,640.45/150,960.57 = 25,760.47/x
  3. Step 3: Cross multiply
    100,640.45x = 150,960.57 × 25,760.47
  4. Step 4: Simplify right side
    100,640.45x = 3,888,815,649.42
  5. Step 5: Solve for x
    x = 3,888,815,649.42/100,640.45
  6. Step 6: Final answer
    x = 38,640.68

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1.5x scale

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.