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Finding the Fourth Proportional to 401.64, 553.98 and 254.31

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Solution

The fourth proportional to 401.64, 553.98 and 254.31 is: 350.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    401.64 : 553.98 = 254.31 : x
  2. Step 2: Convert to fraction form
    401.64/553.98 = 254.31/x
  3. Step 3: Cross multiply
    401.64x = 553.98 × 254.31
  4. Step 4: Simplify right side
    401.64x = 140,882.65
  5. Step 5: Solve for x
    x = 140,882.65/401.64
  6. Step 6: Final answer
    x = 350.77

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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.