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Finding the Fourth Proportional to 407.66, 610.89 and 321.21

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Solution

The fourth proportional to 407.66, 610.89 and 321.21 is: 481.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    407.66 : 610.89 = 321.21 : x
  2. Step 2: Convert to fraction form
    407.66/610.89 = 321.21/x
  3. Step 3: Cross multiply
    407.66x = 610.89 × 321.21
  4. Step 4: Simplify right side
    407.66x = 196,220.92
  5. Step 5: Solve for x
    x = 196,220.92/407.66
  6. Step 6: Final answer
    x = 481.33

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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.