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Finding the Fourth Proportional to 211.09, 316.67 and 79.36

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Solution

The fourth proportional to 211.09, 316.67 and 79.36 is: 119.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.09 : 316.67 = 79.36 : x
  2. Step 2: Convert to fraction form
    211.09/316.67 = 79.36/x
  3. Step 3: Cross multiply
    211.09x = 316.67 × 79.36
  4. Step 4: Simplify right side
    211.09x = 25,131.75
  5. Step 5: Solve for x
    x = 25,131.75/211.09
  6. Step 6: Final answer
    x = 119.05

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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.