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Finding the Fourth Proportional to 401.26, 553.57 and 243.90

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Solution

The fourth proportional to 401.26, 553.57 and 243.90 is: 336.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    401.26 : 553.57 = 243.90 : x
  2. Step 2: Convert to fraction form
    401.26/553.57 = 243.90/x
  3. Step 3: Cross multiply
    401.26x = 553.57 × 243.90
  4. Step 4: Simplify right side
    401.26x = 135,015.72
  5. Step 5: Solve for x
    x = 135,015.72/401.26
  6. Step 6: Final answer
    x = 336.48

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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.