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Finding the Fourth Proportional to 18,811.10, 28,218.06 and 6,331.16

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Solution

The fourth proportional to 18,811.10, 28,218.06 and 6,331.16 is: 9,497.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,811.10 : 28,218.06 = 6,331.16 : x
  2. Step 2: Convert to fraction form
    18,811.10/28,218.06 = 6,331.16/x
  3. Step 3: Cross multiply
    18,811.10x = 28,218.06 × 6,331.16
  4. Step 4: Simplify right side
    18,811.10x = 178,653,052.75
  5. Step 5: Solve for x
    x = 178,653,052.75/18,811.10
  6. Step 6: Final answer
    x = 9,497.21

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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.