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Finding the Fourth Proportional to 660.40, 990.28 and 227.44

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Solution

The fourth proportional to 660.40, 990.28 and 227.44 is: 341.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.40 : 990.28 = 227.44 : x
  2. Step 2: Convert to fraction form
    660.40/990.28 = 227.44/x
  3. Step 3: Cross multiply
    660.40x = 990.28 × 227.44
  4. Step 4: Simplify right side
    660.40x = 225,229.28
  5. Step 5: Solve for x
    x = 225,229.28/660.40
  6. Step 6: Final answer
    x = 341.05

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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.