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Finding the Fourth Proportional to 399.25, 550.84 and 259.55

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Solution

The fourth proportional to 399.25, 550.84 and 259.55 is: 358.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.25 : 550.84 = 259.55 : x
  2. Step 2: Convert to fraction form
    399.25/550.84 = 259.55/x
  3. Step 3: Cross multiply
    399.25x = 550.84 × 259.55
  4. Step 4: Simplify right side
    399.25x = 142,970.52
  5. Step 5: Solve for x
    x = 142,970.52/399.25
  6. Step 6: Final answer
    x = 358.10

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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.