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Finding the Fourth Proportional to 661.13, 991.82 and 222.35

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Solution

The fourth proportional to 661.13, 991.82 and 222.35 is: 333.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.13 : 991.82 = 222.35 : x
  2. Step 2: Convert to fraction form
    661.13/991.82 = 222.35/x
  3. Step 3: Cross multiply
    661.13x = 991.82 × 222.35
  4. Step 4: Simplify right side
    661.13x = 220,525.11
  5. Step 5: Solve for x
    x = 220,525.11/661.13
  6. Step 6: Final answer
    x = 333.56

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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.