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Finding the Fourth Proportional to 218,420.78, 327,669.65 and 90,336.69

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Solution

The fourth proportional to 218,420.78, 327,669.65 and 90,336.69 is: 135,520.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,420.78 : 327,669.65 = 90,336.69 : x
  2. Step 2: Convert to fraction form
    218,420.78/327,669.65 = 90,336.69/x
  3. Step 3: Cross multiply
    218,420.78x = 327,669.65 × 90,336.69
  4. Step 4: Simplify right side
    218,420.78x = 29,600,591,142.78
  5. Step 5: Solve for x
    x = 29,600,591,142.78/218,420.78
  6. Step 6: Final answer
    x = 135,520.95

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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.