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Finding the Fourth Proportional to 28,323.75, 42,479.03 and 12,520.20

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Solution

The fourth proportional to 28,323.75, 42,479.03 and 12,520.20 is: 18,777.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,323.75 : 42,479.03 = 12,520.20 : x
  2. Step 2: Convert to fraction form
    28,323.75/42,479.03 = 12,520.20/x
  3. Step 3: Cross multiply
    28,323.75x = 42,479.03 × 12,520.20
  4. Step 4: Simplify right side
    28,323.75x = 531,846,142.00
  5. Step 5: Solve for x
    x = 531,846,142.00/28,323.75
  6. Step 6: Final answer
    x = 18,777.39

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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.