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Finding the Fourth Proportional to 308.63, 425.98 and 203.90

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Solution

The fourth proportional to 308.63, 425.98 and 203.90 is: 281.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    308.63 : 425.98 = 203.90 : x
  2. Step 2: Convert to fraction form
    308.63/425.98 = 203.90/x
  3. Step 3: Cross multiply
    308.63x = 425.98 × 203.90
  4. Step 4: Simplify right side
    308.63x = 86,855.45
  5. Step 5: Solve for x
    x = 86,855.45/308.63
  6. Step 6: Final answer
    x = 281.42

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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.