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Finding the Fourth Proportional to 356.72, 492.21 and 225.90

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Solution

The fourth proportional to 356.72, 492.21 and 225.90 is: 311.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    356.72 : 492.21 = 225.90 : x
  2. Step 2: Convert to fraction form
    356.72/492.21 = 225.90/x
  3. Step 3: Cross multiply
    356.72x = 492.21 × 225.90
  4. Step 4: Simplify right side
    356.72x = 111,190.24
  5. Step 5: Solve for x
    x = 111,190.24/356.72
  6. Step 6: Final answer
    x = 311.71

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.