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Finding the Fourth Proportional to 400.94, 553.40 and 261.41

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Solution

The fourth proportional to 400.94, 553.40 and 261.41 is: 360.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    400.94 : 553.40 = 261.41 : x
  2. Step 2: Convert to fraction form
    400.94/553.40 = 261.41/x
  3. Step 3: Cross multiply
    400.94x = 553.40 × 261.41
  4. Step 4: Simplify right side
    400.94x = 144,664.29
  5. Step 5: Solve for x
    x = 144,664.29/400.94
  6. Step 6: Final answer
    x = 360.81

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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.