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Finding the Fourth Proportional to 239.09, 358.11 and 211.75

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Solution

The fourth proportional to 239.09, 358.11 and 211.75 is: 317.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    239.09 : 358.11 = 211.75 : x
  2. Step 2: Convert to fraction form
    239.09/358.11 = 211.75/x
  3. Step 3: Cross multiply
    239.09x = 358.11 × 211.75
  4. Step 4: Simplify right side
    239.09x = 75,829.79
  5. Step 5: Solve for x
    x = 75,829.79/239.09
  6. Step 6: Final answer
    x = 317.16

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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.