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Finding the Fourth Proportional to 661.60, 991.69 and 222.43

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Solution

The fourth proportional to 661.60, 991.69 and 222.43 is: 333.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.60 : 991.69 = 222.43 : x
  2. Step 2: Convert to fraction form
    661.60/991.69 = 222.43/x
  3. Step 3: Cross multiply
    661.60x = 991.69 × 222.43
  4. Step 4: Simplify right side
    661.60x = 220,579.68
  5. Step 5: Solve for x
    x = 220,579.68/661.60
  6. Step 6: Final answer
    x = 333.41

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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.