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Finding the Fourth Proportional to 213.67, 321.13 and 145.63

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Solution

The fourth proportional to 213.67, 321.13 and 145.63 is: 218.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    213.67 : 321.13 = 145.63 : x
  2. Step 2: Convert to fraction form
    213.67/321.13 = 145.63/x
  3. Step 3: Cross multiply
    213.67x = 321.13 × 145.63
  4. Step 4: Simplify right side
    213.67x = 46,766.16
  5. Step 5: Solve for x
    x = 46,766.16/213.67
  6. Step 6: Final answer
    x = 218.87

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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.