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Finding the Fourth Proportional to 18,387.54, 27,561.56 and 7,278.80

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Solution

The fourth proportional to 18,387.54, 27,561.56 and 7,278.80 is: 10,910.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,387.54 : 27,561.56 = 7,278.80 : x
  2. Step 2: Convert to fraction form
    18,387.54/27,561.56 = 7,278.80/x
  3. Step 3: Cross multiply
    18,387.54x = 27,561.56 × 7,278.80
  4. Step 4: Simplify right side
    18,387.54x = 200,615,082.93
  5. Step 5: Solve for x
    x = 200,615,082.93/18,387.54
  6. Step 6: Final answer
    x = 10,910.38

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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.