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Finding the Fourth Proportional to 481.55, 664.37 and 315.87

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Solution

The fourth proportional to 481.55, 664.37 and 315.87 is: 435.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    481.55 : 664.37 = 315.87 : x
  2. Step 2: Convert to fraction form
    481.55/664.37 = 315.87/x
  3. Step 3: Cross multiply
    481.55x = 664.37 × 315.87
  4. Step 4: Simplify right side
    481.55x = 209,851.67
  5. Step 5: Solve for x
    x = 209,851.67/481.55
  6. Step 6: Final answer
    x = 435.79

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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.