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Finding the Fourth Proportional to 398.39, 596.94 and 261.33

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Solution

The fourth proportional to 398.39, 596.94 and 261.33 is: 391.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    398.39 : 596.94 = 261.33 : x
  2. Step 2: Convert to fraction form
    398.39/596.94 = 261.33/x
  3. Step 3: Cross multiply
    398.39x = 596.94 × 261.33
  4. Step 4: Simplify right side
    398.39x = 155,995.11
  5. Step 5: Solve for x
    x = 155,995.11/398.39
  6. Step 6: Final answer
    x = 391.57

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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.