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Finding the Fourth Proportional to 481.30, 664.02 and 315.61

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Solution

The fourth proportional to 481.30, 664.02 and 315.61 is: 435.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    481.30 : 664.02 = 315.61 : x
  2. Step 2: Convert to fraction form
    481.30/664.02 = 315.61/x
  3. Step 3: Cross multiply
    481.30x = 664.02 × 315.61
  4. Step 4: Simplify right side
    481.30x = 209,566.45
  5. Step 5: Solve for x
    x = 209,566.45/481.30
  6. Step 6: Final answer
    x = 435.42

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.