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Finding the Fourth Proportional to 18,127.20, 27,190.80 and 11,906.40

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Solution

The fourth proportional to 18,127.20, 27,190.80 and 11,906.40 is: 17,859.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,127.20 : 27,190.80 = 11,906.40 : x
  2. Step 2: Convert to fraction form
    18,127.20/27,190.80 = 11,906.40/x
  3. Step 3: Cross multiply
    18,127.20x = 27,190.80 × 11,906.40
  4. Step 4: Simplify right side
    18,127.20x = 323,744,541.12
  5. Step 5: Solve for x
    x = 323,744,541.12/18,127.20
  6. Step 6: Final answer
    x = 17,859.60

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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.