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Finding the Fourth Proportional to 609.68, 914.48 and 321.28

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Solution

The fourth proportional to 609.68, 914.48 and 321.28 is: 481.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    609.68 : 914.48 = 321.28 : x
  2. Step 2: Convert to fraction form
    609.68/914.48 = 321.28/x
  3. Step 3: Cross multiply
    609.68x = 914.48 × 321.28
  4. Step 4: Simplify right side
    609.68x = 293,804.13
  5. Step 5: Solve for x
    x = 293,804.13/609.68
  6. Step 6: Final answer
    x = 481.90

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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.