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Finding the Fourth Proportional to 401.36, 553.80 and 243.92

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Solution

The fourth proportional to 401.36, 553.80 and 243.92 is: 336.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    401.36 : 553.80 = 243.92 : x
  2. Step 2: Convert to fraction form
    401.36/553.80 = 243.92/x
  3. Step 3: Cross multiply
    401.36x = 553.80 × 243.92
  4. Step 4: Simplify right side
    401.36x = 135,082.90
  5. Step 5: Solve for x
    x = 135,082.90/401.36
  6. Step 6: Final answer
    x = 336.56

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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.