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Finding the Fourth Proportional to 243.55, 336.21 and 160.66

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Solution

The fourth proportional to 243.55, 336.21 and 160.66 is: 221.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    243.55 : 336.21 = 160.66 : x
  2. Step 2: Convert to fraction form
    243.55/336.21 = 160.66/x
  3. Step 3: Cross multiply
    243.55x = 336.21 × 160.66
  4. Step 4: Simplify right side
    243.55x = 54,015.50
  5. Step 5: Solve for x
    x = 54,015.50/243.55
  6. Step 6: Final answer
    x = 221.78

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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.