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Finding the Fourth Proportional to 18,464.40, 27,631.80 and 12,891.60

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Solution

The fourth proportional to 18,464.40, 27,631.80 and 12,891.60 is: 19,292.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,464.40 : 27,631.80 = 12,891.60 : x
  2. Step 2: Convert to fraction form
    18,464.40/27,631.80 = 12,891.60/x
  3. Step 3: Cross multiply
    18,464.40x = 27,631.80 × 12,891.60
  4. Step 4: Simplify right side
    18,464.40x = 356,218,112.88
  5. Step 5: Solve for x
    x = 356,218,112.88/18,464.40
  6. Step 6: Final answer
    x = 19,292.16

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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.