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Finding the Fourth Proportional to 398.56, 598.12 and 203.44

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Solution

The fourth proportional to 398.56, 598.12 and 203.44 is: 305.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    398.56 : 598.12 = 203.44 : x
  2. Step 2: Convert to fraction form
    398.56/598.12 = 203.44/x
  3. Step 3: Cross multiply
    398.56x = 598.12 × 203.44
  4. Step 4: Simplify right side
    398.56x = 121,679.83
  5. Step 5: Solve for x
    x = 121,679.83/398.56
  6. Step 6: Final answer
    x = 305.30

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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.