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Finding the Fourth Proportional to 18,719.62, 25,832.87 and 10,221.72

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Solution

The fourth proportional to 18,719.62, 25,832.87 and 10,221.72 is: 14,105.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,719.62 : 25,832.87 = 10,221.72 : x
  2. Step 2: Convert to fraction form
    18,719.62/25,832.87 = 10,221.72/x
  3. Step 3: Cross multiply
    18,719.62x = 25,832.87 × 10,221.72
  4. Step 4: Simplify right side
    18,719.62x = 264,056,363.94
  5. Step 5: Solve for x
    x = 264,056,363.94/18,719.62
  6. Step 6: Final answer
    x = 14,105.86

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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.