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Finding the Fourth Proportional to 18,381.72, 27,567.66 and 7,991

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Solution

The fourth proportional to 18,381.72, 27,567.66 and 7,991 is: 11,984.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,381.72 : 27,567.66 = 7,991 : x
  2. Step 2: Convert to fraction form
    18,381.72/27,567.66 = 7,991/x
  3. Step 3: Cross multiply
    18,381.72x = 27,567.66 × 7,991
  4. Step 4: Simplify right side
    18,381.72x = 220,293,171.06
  5. Step 5: Solve for x
    x = 220,293,171.06/18,381.72
  6. Step 6: Final answer
    x = 11,984.36

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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.