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Finding the Fourth Proportional to 18,215.32, 27,321.72 and 7,119.88

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Solution

The fourth proportional to 18,215.32, 27,321.72 and 7,119.88 is: 10,679.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,215.32 : 27,321.72 = 7,119.88 : x
  2. Step 2: Convert to fraction form
    18,215.32/27,321.72 = 7,119.88/x
  3. Step 3: Cross multiply
    18,215.32x = 27,321.72 × 7,119.88
  4. Step 4: Simplify right side
    18,215.32x = 194,527,367.79
  5. Step 5: Solve for x
    x = 194,527,367.79/18,215.32
  6. Step 6: Final answer
    x = 10,679.33

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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.