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Finding the Fourth Proportional to 661.17, 991.42 and 222.27

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Solution

The fourth proportional to 661.17, 991.42 and 222.27 is: 333.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.17 : 991.42 = 222.27 : x
  2. Step 2: Convert to fraction form
    661.17/991.42 = 222.27/x
  3. Step 3: Cross multiply
    661.17x = 991.42 × 222.27
  4. Step 4: Simplify right side
    661.17x = 220,362.92
  5. Step 5: Solve for x
    x = 220,362.92/661.17
  6. Step 6: Final answer
    x = 333.29

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1.5x scale

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.