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Finding the Fourth Proportional to 356.44, 491.80 and 225.60

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Solution

The fourth proportional to 356.44, 491.80 and 225.60 is: 311.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    356.44 : 491.80 = 225.60 : x
  2. Step 2: Convert to fraction form
    356.44/491.80 = 225.60/x
  3. Step 3: Cross multiply
    356.44x = 491.80 × 225.60
  4. Step 4: Simplify right side
    356.44x = 110,950.08
  5. Step 5: Solve for x
    x = 110,950.08/356.44
  6. Step 6: Final answer
    x = 311.27

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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.