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Finding the Fourth Proportional to 211.31, 317.01 and 103.09

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Solution

The fourth proportional to 211.31, 317.01 and 103.09 is: 154.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.31 : 317.01 = 103.09 : x
  2. Step 2: Convert to fraction form
    211.31/317.01 = 103.09/x
  3. Step 3: Cross multiply
    211.31x = 317.01 × 103.09
  4. Step 4: Simplify right side
    211.31x = 32,680.56
  5. Step 5: Solve for x
    x = 32,680.56/211.31
  6. Step 6: Final answer
    x = 154.66

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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.