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Finding the Fourth Proportional to 399.90, 553.32 and 348.27

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Solution

The fourth proportional to 399.90, 553.32 and 348.27 is: 481.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.90 : 553.32 = 348.27 : x
  2. Step 2: Convert to fraction form
    399.90/553.32 = 348.27/x
  3. Step 3: Cross multiply
    399.90x = 553.32 × 348.27
  4. Step 4: Simplify right side
    399.90x = 192,704.76
  5. Step 5: Solve for x
    x = 192,704.76/399.90
  6. Step 6: Final answer
    x = 481.88

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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.