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Finding the Fourth Proportional to 319.82, 440.94 and 221.60

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Solution

The fourth proportional to 319.82, 440.94 and 221.60 is: 305.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.82 : 440.94 = 221.60 : x
  2. Step 2: Convert to fraction form
    319.82/440.94 = 221.60/x
  3. Step 3: Cross multiply
    319.82x = 440.94 × 221.60
  4. Step 4: Simplify right side
    319.82x = 97,714.24
  5. Step 5: Solve for x
    x = 97,714.24/319.82
  6. Step 6: Final answer
    x = 305.53

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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.