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Finding the Fourth Proportional to 128,279.20, 192,505.20 and 75,632.80

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Solution

The fourth proportional to 128,279.20, 192,505.20 and 75,632.80 is: 113,500.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,279.20 : 192,505.20 = 75,632.80 : x
  2. Step 2: Convert to fraction form
    128,279.20/192,505.20 = 75,632.80/x
  3. Step 3: Cross multiply
    128,279.20x = 192,505.20 × 75,632.80
  4. Step 4: Simplify right side
    128,279.20x = 14,559,707,290.56
  5. Step 5: Solve for x
    x = 14,559,707,290.56/128,279.20
  6. Step 6: Final answer
    x = 113,500.14

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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.