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Finding the Fourth Proportional to 66,939.28, 100,423.76 and 20,188.78

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Solution

The fourth proportional to 66,939.28, 100,423.76 and 20,188.78 is: 30,287.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,939.28 : 100,423.76 = 20,188.78 : x
  2. Step 2: Convert to fraction form
    66,939.28/100,423.76 = 20,188.78/x
  3. Step 3: Cross multiply
    66,939.28x = 100,423.76 × 20,188.78
  4. Step 4: Simplify right side
    66,939.28x = 2,027,433,197.41
  5. Step 5: Solve for x
    x = 2,027,433,197.41/66,939.28
  6. Step 6: Final answer
    x = 30,287.65

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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.