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Finding the Fourth Proportional to 12,120.80, 18,200.40 and 8,856.80

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Solution

The fourth proportional to 12,120.80, 18,200.40 and 8,856.80 is: 13,299.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,120.80 : 18,200.40 = 8,856.80 : x
  2. Step 2: Convert to fraction form
    12,120.80/18,200.40 = 8,856.80/x
  3. Step 3: Cross multiply
    12,120.80x = 18,200.40 × 8,856.80
  4. Step 4: Simplify right side
    12,120.80x = 161,197,302.72
  5. Step 5: Solve for x
    x = 161,197,302.72/12,120.80
  6. Step 6: Final answer
    x = 13,299.23

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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.