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Finding the Fourth Proportional to 90,812.78, 136,239.90 and 27,641.86

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Solution

The fourth proportional to 90,812.78, 136,239.90 and 27,641.86 is: 41,469.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,812.78 : 136,239.90 = 27,641.86 : x
  2. Step 2: Convert to fraction form
    90,812.78/136,239.90 = 27,641.86/x
  3. Step 3: Cross multiply
    90,812.78x = 136,239.90 × 27,641.86
  4. Step 4: Simplify right side
    90,812.78x = 3,765,923,561.01
  5. Step 5: Solve for x
    x = 3,765,923,561.01/90,812.78
  6. Step 6: Final answer
    x = 41,469.09

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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.