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Finding the Fourth Proportional to 76,439.20, 114,658.80 and 20,279.20

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Solution

The fourth proportional to 76,439.20, 114,658.80 and 20,279.20 is: 30,418.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,439.20 : 114,658.80 = 20,279.20 : x
  2. Step 2: Convert to fraction form
    76,439.20/114,658.80 = 20,279.20/x
  3. Step 3: Cross multiply
    76,439.20x = 114,658.80 × 20,279.20
  4. Step 4: Simplify right side
    76,439.20x = 2,325,188,736.96
  5. Step 5: Solve for x
    x = 2,325,188,736.96/76,439.20
  6. Step 6: Final answer
    x = 30,418.80

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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.