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Finding the Fourth Proportional to 310.42, 428.25 and 261.21

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Solution

The fourth proportional to 310.42, 428.25 and 261.21 is: 360.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    310.42 : 428.25 = 261.21 : x
  2. Step 2: Convert to fraction form
    310.42/428.25 = 261.21/x
  3. Step 3: Cross multiply
    310.42x = 428.25 × 261.21
  4. Step 4: Simplify right side
    310.42x = 111,863.18
  5. Step 5: Solve for x
    x = 111,863.18/310.42
  6. Step 6: Final answer
    x = 360.36

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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.