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Finding the Fourth Proportional to 399.30, 550.86 and 251.64

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Solution

The fourth proportional to 399.30, 550.86 and 251.64 is: 347.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.30 : 550.86 = 251.64 : x
  2. Step 2: Convert to fraction form
    399.30/550.86 = 251.64/x
  3. Step 3: Cross multiply
    399.30x = 550.86 × 251.64
  4. Step 4: Simplify right side
    399.30x = 138,618.41
  5. Step 5: Solve for x
    x = 138,618.41/399.30
  6. Step 6: Final answer
    x = 347.15

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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.