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Finding the Fourth Proportional to 399.36, 551.14 and 300.94

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Solution

The fourth proportional to 399.36, 551.14 and 300.94 is: 415.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.36 : 551.14 = 300.94 : x
  2. Step 2: Convert to fraction form
    399.36/551.14 = 300.94/x
  3. Step 3: Cross multiply
    399.36x = 551.14 × 300.94
  4. Step 4: Simplify right side
    399.36x = 165,860.07
  5. Step 5: Solve for x
    x = 165,860.07/399.36
  6. Step 6: Final answer
    x = 415.31

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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.