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Finding the Fourth Proportional to 28,213.92, 42,321.60 and 8,493.12

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Solution

The fourth proportional to 28,213.92, 42,321.60 and 8,493.12 is: 12,739.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,213.92 : 42,321.60 = 8,493.12 : x
  2. Step 2: Convert to fraction form
    28,213.92/42,321.60 = 8,493.12/x
  3. Step 3: Cross multiply
    28,213.92x = 42,321.60 × 8,493.12
  4. Step 4: Simplify right side
    28,213.92x = 359,442,427.39
  5. Step 5: Solve for x
    x = 359,442,427.39/28,213.92
  6. Step 6: Final answer
    x = 12,739.90

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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.