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Finding the Fourth Proportional to 308.31, 425.36 and 203.45

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Solution

The fourth proportional to 308.31, 425.36 and 203.45 is: 280.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    308.31 : 425.36 = 203.45 : x
  2. Step 2: Convert to fraction form
    308.31/425.36 = 203.45/x
  3. Step 3: Cross multiply
    308.31x = 425.36 × 203.45
  4. Step 4: Simplify right side
    308.31x = 86,538.47
  5. Step 5: Solve for x
    x = 86,538.47/308.31
  6. Step 6: Final answer
    x = 280.69

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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.