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Finding the Fourth Proportional to 213.43, 320.25 and 105.23

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Solution

The fourth proportional to 213.43, 320.25 and 105.23 is: 157.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    213.43 : 320.25 = 105.23 : x
  2. Step 2: Convert to fraction form
    213.43/320.25 = 105.23/x
  3. Step 3: Cross multiply
    213.43x = 320.25 × 105.23
  4. Step 4: Simplify right side
    213.43x = 33,699.91
  5. Step 5: Solve for x
    x = 33,699.91/213.43
  6. Step 6: Final answer
    x = 157.90

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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.