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Finding the Fourth Proportional to 12,187.20, 18,280.80 and 10,516.80

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Solution

The fourth proportional to 12,187.20, 18,280.80 and 10,516.80 is: 15,775.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,187.20 : 18,280.80 = 10,516.80 : x
  2. Step 2: Convert to fraction form
    12,187.20/18,280.80 = 10,516.80/x
  3. Step 3: Cross multiply
    12,187.20x = 18,280.80 × 10,516.80
  4. Step 4: Simplify right side
    12,187.20x = 192,255,517.44
  5. Step 5: Solve for x
    x = 192,255,517.44/12,187.20
  6. Step 6: Final answer
    x = 15,775.20

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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.