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Finding the Fourth Proportional to 321.85, 482.68 and 157.22

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Solution

The fourth proportional to 321.85, 482.68 and 157.22 is: 235.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.85 : 482.68 = 157.22 : x
  2. Step 2: Convert to fraction form
    321.85/482.68 = 157.22/x
  3. Step 3: Cross multiply
    321.85x = 482.68 × 157.22
  4. Step 4: Simplify right side
    321.85x = 75,884.14
  5. Step 5: Solve for x
    x = 75,884.14/321.85
  6. Step 6: Final answer
    x = 235.78

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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.