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Finding the Fourth Proportional to 220.99, 305.53 and 211.31

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Solution

The fourth proportional to 220.99, 305.53 and 211.31 is: 292.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    220.99 : 305.53 = 211.31 : x
  2. Step 2: Convert to fraction form
    220.99/305.53 = 211.31/x
  3. Step 3: Cross multiply
    220.99x = 305.53 × 211.31
  4. Step 4: Simplify right side
    220.99x = 64,558.96
  5. Step 5: Solve for x
    x = 64,558.96/220.99
  6. Step 6: Final answer
    x = 292.14

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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.