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Finding the Fourth Proportional to 356.44, 491.94 and 225.49

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Solution

The fourth proportional to 356.44, 491.94 and 225.49 is: 311.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    356.44 : 491.94 = 225.49 : x
  2. Step 2: Convert to fraction form
    356.44/491.94 = 225.49/x
  3. Step 3: Cross multiply
    356.44x = 491.94 × 225.49
  4. Step 4: Simplify right side
    356.44x = 110,927.55
  5. Step 5: Solve for x
    x = 110,927.55/356.44
  6. Step 6: Final answer
    x = 311.21

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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.