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Finding the Fourth Proportional to 213.55, 320.31 and 69.27

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Solution

The fourth proportional to 213.55, 320.31 and 69.27 is: 103.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    213.55 : 320.31 = 69.27 : x
  2. Step 2: Convert to fraction form
    213.55/320.31 = 69.27/x
  3. Step 3: Cross multiply
    213.55x = 320.31 × 69.27
  4. Step 4: Simplify right side
    213.55x = 22,186.67
  5. Step 5: Solve for x
    x = 22,186.67/213.55
  6. Step 6: Final answer
    x = 103.90

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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.