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Finding the Fourth Proportional to 215.31, 323.01 and 71.13

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Solution

The fourth proportional to 215.31, 323.01 and 71.13 is: 106.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.31 : 323.01 = 71.13 : x
  2. Step 2: Convert to fraction form
    215.31/323.01 = 71.13/x
  3. Step 3: Cross multiply
    215.31x = 323.01 × 71.13
  4. Step 4: Simplify right side
    215.31x = 22,975.70
  5. Step 5: Solve for x
    x = 22,975.70/215.31
  6. Step 6: Final answer
    x = 106.71

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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.