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Finding the Fourth Proportional to 308.31, 425.43 and 261.87

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Solution

The fourth proportional to 308.31, 425.43 and 261.87 is: 361.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    308.31 : 425.43 = 261.87 : x
  2. Step 2: Convert to fraction form
    308.31/425.43 = 261.87/x
  3. Step 3: Cross multiply
    308.31x = 425.43 × 261.87
  4. Step 4: Simplify right side
    308.31x = 111,407.35
  5. Step 5: Solve for x
    x = 111,407.35/308.31
  6. Step 6: Final answer
    x = 361.35

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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.