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Finding the Fourth Proportional to 629.12, 944.55 and 321.21

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Solution

The fourth proportional to 629.12, 944.55 and 321.21 is: 482.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    629.12 : 944.55 = 321.21 : x
  2. Step 2: Convert to fraction form
    629.12/944.55 = 321.21/x
  3. Step 3: Cross multiply
    629.12x = 944.55 × 321.21
  4. Step 4: Simplify right side
    629.12x = 303,398.91
  5. Step 5: Solve for x
    x = 303,398.91/629.12
  6. Step 6: Final answer
    x = 482.26

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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.