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Finding the Fourth Proportional to 401.91, 553.82 and 261.87

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Solution

The fourth proportional to 401.91, 553.82 and 261.87 is: 360.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    401.91 : 553.82 = 261.87 : x
  2. Step 2: Convert to fraction form
    401.91/553.82 = 261.87/x
  3. Step 3: Cross multiply
    401.91x = 553.82 × 261.87
  4. Step 4: Simplify right side
    401.91x = 145,028.84
  5. Step 5: Solve for x
    x = 145,028.84/401.91
  6. Step 6: Final answer
    x = 360.85

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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.