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Finding the Fourth Proportional to 661.35, 991.86 and 222.54

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Solution

The fourth proportional to 661.35, 991.86 and 222.54 is: 333.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.35 : 991.86 = 222.54 : x
  2. Step 2: Convert to fraction form
    661.35/991.86 = 222.54/x
  3. Step 3: Cross multiply
    661.35x = 991.86 × 222.54
  4. Step 4: Simplify right side
    661.35x = 220,723.57
  5. Step 5: Solve for x
    x = 220,723.57/661.35
  6. Step 6: Final answer
    x = 333.75

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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.