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Finding the Fourth Proportional to 17,912.80, 26,869.20 and 12,383.20

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Solution

The fourth proportional to 17,912.80, 26,869.20 and 12,383.20 is: 18,574.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    17,912.80 : 26,869.20 = 12,383.20 : x
  2. Step 2: Convert to fraction form
    17,912.80/26,869.20 = 12,383.20/x
  3. Step 3: Cross multiply
    17,912.80x = 26,869.20 × 12,383.20
  4. Step 4: Simplify right side
    17,912.80x = 332,726,677.44
  5. Step 5: Solve for x
    x = 332,726,677.44/17,912.80
  6. Step 6: Final answer
    x = 18,574.80

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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.