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Finding the Fourth Proportional to 211.60, 316.31 and 163

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Solution

The fourth proportional to 211.60, 316.31 and 163 is: 243.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.60 : 316.31 = 163 : x
  2. Step 2: Convert to fraction form
    211.60/316.31 = 163/x
  3. Step 3: Cross multiply
    211.60x = 316.31 × 163
  4. Step 4: Simplify right side
    211.60x = 51,558.53
  5. Step 5: Solve for x
    x = 51,558.53/211.60
  6. Step 6: Final answer
    x = 243.66

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.