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Finding the Fourth Proportional to 211.49, 317.21 and 67.19

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Solution

The fourth proportional to 211.49, 317.21 and 67.19 is: 100.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.49 : 317.21 = 67.19 : x
  2. Step 2: Convert to fraction form
    211.49/317.21 = 67.19/x
  3. Step 3: Cross multiply
    211.49x = 317.21 × 67.19
  4. Step 4: Simplify right side
    211.49x = 21,313.80
  5. Step 5: Solve for x
    x = 21,313.80/211.49
  6. Step 6: Final answer
    x = 100.78

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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.