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Finding the Fourth Proportional to 211.15, 316.79 and 108.46

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Solution

The fourth proportional to 211.15, 316.79 and 108.46 is: 162.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.15 : 316.79 = 108.46 : x
  2. Step 2: Convert to fraction form
    211.15/316.79 = 108.46/x
  3. Step 3: Cross multiply
    211.15x = 316.79 × 108.46
  4. Step 4: Simplify right side
    211.15x = 34,359.04
  5. Step 5: Solve for x
    x = 34,359.04/211.15
  6. Step 6: Final answer
    x = 162.72

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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.