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Finding the Fourth Proportional to 213.12, 320.31 and 104.99

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Solution

The fourth proportional to 213.12, 320.31 and 104.99 is: 157.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    213.12 : 320.31 = 104.99 : x
  2. Step 2: Convert to fraction form
    213.12/320.31 = 104.99/x
  3. Step 3: Cross multiply
    213.12x = 320.31 × 104.99
  4. Step 4: Simplify right side
    213.12x = 33,627.75
  5. Step 5: Solve for x
    x = 33,627.75/213.12
  6. Step 6: Final answer
    x = 157.79

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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.