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Finding the Fourth Proportional to 220.85, 305.15 and 193.18

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Solution

The fourth proportional to 220.85, 305.15 and 193.18 is: 266.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    220.85 : 305.15 = 193.18 : x
  2. Step 2: Convert to fraction form
    220.85/305.15 = 193.18/x
  3. Step 3: Cross multiply
    220.85x = 305.15 × 193.18
  4. Step 4: Simplify right side
    220.85x = 58,948.60
  5. Step 5: Solve for x
    x = 58,948.60/220.85
  6. Step 6: Final answer
    x = 266.91

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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.