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Finding the Fourth Proportional to 18,439.86, 27,663.89 and 5,291.22

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Solution

The fourth proportional to 18,439.86, 27,663.89 and 5,291.22 is: 7,938.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,439.86 : 27,663.89 = 5,291.22 : x
  2. Step 2: Convert to fraction form
    18,439.86/27,663.89 = 5,291.22/x
  3. Step 3: Cross multiply
    18,439.86x = 27,663.89 × 5,291.22
  4. Step 4: Simplify right side
    18,439.86x = 146,375,701.59
  5. Step 5: Solve for x
    x = 146,375,701.59/18,439.86
  6. Step 6: Final answer
    x = 7,938.01

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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.