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Finding the Fourth Proportional to 398.25, 598.26 and 261.51

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Solution

The fourth proportional to 398.25, 598.26 and 261.51 is: 392.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    398.25 : 598.26 = 261.51 : x
  2. Step 2: Convert to fraction form
    398.25/598.26 = 261.51/x
  3. Step 3: Cross multiply
    398.25x = 598.26 × 261.51
  4. Step 4: Simplify right side
    398.25x = 156,450.97
  5. Step 5: Solve for x
    x = 156,450.97/398.25
  6. Step 6: Final answer
    x = 392.85

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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.