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Finding the Fourth Proportional to 401.28, 553.76 and 235.47

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Solution

The fourth proportional to 401.28, 553.76 and 235.47 is: 324.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    401.28 : 553.76 = 235.47 : x
  2. Step 2: Convert to fraction form
    401.28/553.76 = 235.47/x
  3. Step 3: Cross multiply
    401.28x = 553.76 × 235.47
  4. Step 4: Simplify right side
    401.28x = 130,392.30
  5. Step 5: Solve for x
    x = 130,392.30/401.28
  6. Step 6: Final answer
    x = 324.94

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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.