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Finding the Fourth Proportional to 220.66, 331.50 and 208.36

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Solution

The fourth proportional to 220.66, 331.50 and 208.36 is: 313.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    220.66 : 331.50 = 208.36 : x
  2. Step 2: Convert to fraction form
    220.66/331.50 = 208.36/x
  3. Step 3: Cross multiply
    220.66x = 331.50 × 208.36
  4. Step 4: Simplify right side
    220.66x = 69,071.34
  5. Step 5: Solve for x
    x = 69,071.34/220.66
  6. Step 6: Final answer
    x = 313.02

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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.