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Finding the Fourth Proportional to 211.99, 317.99 and 67.71

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Solution

The fourth proportional to 211.99, 317.99 and 67.71 is: 101.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.99 : 317.99 = 67.71 : x
  2. Step 2: Convert to fraction form
    211.99/317.99 = 67.71/x
  3. Step 3: Cross multiply
    211.99x = 317.99 × 67.71
  4. Step 4: Simplify right side
    211.99x = 21,531.57
  5. Step 5: Solve for x
    x = 21,531.57/211.99
  6. Step 6: Final answer
    x = 101.57

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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.