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Finding the Fourth Proportional to 211.79, 317.16 and 108.71

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Solution

The fourth proportional to 211.79, 317.16 and 108.71 is: 162.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.79 : 317.16 = 108.71 : x
  2. Step 2: Convert to fraction form
    211.79/317.16 = 108.71/x
  3. Step 3: Cross multiply
    211.79x = 317.16 × 108.71
  4. Step 4: Simplify right side
    211.79x = 34,476.88
  5. Step 5: Solve for x
    x = 34,476.88/211.79
  6. Step 6: Final answer
    x = 162.79

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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.