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Finding the Fourth Proportional to 399.15, 550.53 and 352.44

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Solution

The fourth proportional to 399.15, 550.53 and 352.44 is: 486.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.15 : 550.53 = 352.44 : x
  2. Step 2: Convert to fraction form
    399.15/550.53 = 352.44/x
  3. Step 3: Cross multiply
    399.15x = 550.53 × 352.44
  4. Step 4: Simplify right side
    399.15x = 194,028.79
  5. Step 5: Solve for x
    x = 194,028.79/399.15
  6. Step 6: Final answer
    x = 486.10

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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.