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Finding the Fourth Proportional to 12,169.70, 18,218.10 and 7,236.80

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Solution

The fourth proportional to 12,169.70, 18,218.10 and 7,236.80 is: 10,833.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,169.70 : 18,218.10 = 7,236.80 : x
  2. Step 2: Convert to fraction form
    12,169.70/18,218.10 = 7,236.80/x
  3. Step 3: Cross multiply
    12,169.70x = 18,218.10 × 7,236.80
  4. Step 4: Simplify right side
    12,169.70x = 131,840,746.08
  5. Step 5: Solve for x
    x = 131,840,746.08/12,169.70
  6. Step 6: Final answer
    x = 10,833.52

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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.