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Finding the Fourth Proportional to 18,644.20, 25,719.78 and 15,879.40

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Solution

The fourth proportional to 18,644.20, 25,719.78 and 15,879.40 is: 21,905.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,644.20 : 25,719.78 = 15,879.40 : x
  2. Step 2: Convert to fraction form
    18,644.20/25,719.78 = 15,879.40/x
  3. Step 3: Cross multiply
    18,644.20x = 25,719.78 × 15,879.40
  4. Step 4: Simplify right side
    18,644.20x = 408,414,674.53
  5. Step 5: Solve for x
    x = 408,414,674.53/18,644.20
  6. Step 6: Final answer
    x = 21,905.72

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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.