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Finding the Fourth Proportional to 481.74, 721.38 and 318.92

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Solution

The fourth proportional to 481.74, 721.38 and 318.92 is: 477.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    481.74 : 721.38 = 318.92 : x
  2. Step 2: Convert to fraction form
    481.74/721.38 = 318.92/x
  3. Step 3: Cross multiply
    481.74x = 721.38 × 318.92
  4. Step 4: Simplify right side
    481.74x = 230,062.51
  5. Step 5: Solve for x
    x = 230,062.51/481.74
  6. Step 6: Final answer
    x = 477.57

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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.