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Finding the Fourth Proportional to 18,420.92, 25,409.79 and 11,247.56

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Solution

The fourth proportional to 18,420.92, 25,409.79 and 11,247.56 is: 15,514.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,420.92 : 25,409.79 = 11,247.56 : x
  2. Step 2: Convert to fraction form
    18,420.92/25,409.79 = 11,247.56/x
  3. Step 3: Cross multiply
    18,420.92x = 25,409.79 × 11,247.56
  4. Step 4: Simplify right side
    18,420.92x = 285,798,137.61
  5. Step 5: Solve for x
    x = 285,798,137.61/18,420.92
  6. Step 6: Final answer
    x = 15,514.87

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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.