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Finding the Fourth Proportional to 399.37, 550.91 and 259.29

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Solution

The fourth proportional to 399.37, 550.91 and 259.29 is: 357.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.37 : 550.91 = 259.29 : x
  2. Step 2: Convert to fraction form
    399.37/550.91 = 259.29/x
  3. Step 3: Cross multiply
    399.37x = 550.91 × 259.29
  4. Step 4: Simplify right side
    399.37x = 142,845.45
  5. Step 5: Solve for x
    x = 142,845.45/399.37
  6. Step 6: Final answer
    x = 357.68

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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.