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Finding the Fourth Proportional to 401.45, 553.92 and 308.30

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Solution

The fourth proportional to 401.45, 553.92 and 308.30 is: 425.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    401.45 : 553.92 = 308.30 : x
  2. Step 2: Convert to fraction form
    401.45/553.92 = 308.30/x
  3. Step 3: Cross multiply
    401.45x = 553.92 × 308.30
  4. Step 4: Simplify right side
    401.45x = 170,773.54
  5. Step 5: Solve for x
    x = 170,773.54/401.45
  6. Step 6: Final answer
    x = 425.39

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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.