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Finding the Fourth Proportional to 18,872.64, 28,282.64 and 14,187.16

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Solution

The fourth proportional to 18,872.64, 28,282.64 and 14,187.16 is: 21,260.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,872.64 : 28,282.64 = 14,187.16 : x
  2. Step 2: Convert to fraction form
    18,872.64/28,282.64 = 14,187.16/x
  3. Step 3: Cross multiply
    18,872.64x = 28,282.64 × 14,187.16
  4. Step 4: Simplify right side
    18,872.64x = 401,250,338.90
  5. Step 5: Solve for x
    x = 401,250,338.90/18,872.64
  6. Step 6: Final answer
    x = 21,260.95

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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.