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Finding the Fourth Proportional to 18,471.88, 25,491.78 and 11,398.12

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Solution

The fourth proportional to 18,471.88, 25,491.78 and 11,398.12 is: 15,729.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,471.88 : 25,491.78 = 11,398.12 : x
  2. Step 2: Convert to fraction form
    18,471.88/25,491.78 = 11,398.12/x
  3. Step 3: Cross multiply
    18,471.88x = 25,491.78 × 11,398.12
  4. Step 4: Simplify right side
    18,471.88x = 290,558,367.45
  5. Step 5: Solve for x
    x = 290,558,367.45/18,471.88
  6. Step 6: Final answer
    x = 15,729.77

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.