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Finding the Fourth Proportional to 398.44, 598.11 and 318.25

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Solution

The fourth proportional to 398.44, 598.11 and 318.25 is: 477.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    398.44 : 598.11 = 318.25 : x
  2. Step 2: Convert to fraction form
    398.44/598.11 = 318.25/x
  3. Step 3: Cross multiply
    398.44x = 598.11 × 318.25
  4. Step 4: Simplify right side
    398.44x = 190,348.51
  5. Step 5: Solve for x
    x = 190,348.51/398.44
  6. Step 6: Final answer
    x = 477.73

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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.