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Finding the Fourth Proportional to 398.97, 598.56 and 225.76

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Solution

The fourth proportional to 398.97, 598.56 and 225.76 is: 338.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    398.97 : 598.56 = 225.76 : x
  2. Step 2: Convert to fraction form
    398.97/598.56 = 225.76/x
  3. Step 3: Cross multiply
    398.97x = 598.56 × 225.76
  4. Step 4: Simplify right side
    398.97x = 135,130.91
  5. Step 5: Solve for x
    x = 135,130.91/398.97
  6. Step 6: Final answer
    x = 338.70

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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.