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Finding the Fourth Proportional to 399.21, 551.01 and 266.44

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Solution

The fourth proportional to 399.21, 551.01 and 266.44 is: 367.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.21 : 551.01 = 266.44 : x
  2. Step 2: Convert to fraction form
    399.21/551.01 = 266.44/x
  3. Step 3: Cross multiply
    399.21x = 551.01 × 266.44
  4. Step 4: Simplify right side
    399.21x = 146,811.10
  5. Step 5: Solve for x
    x = 146,811.10/399.21
  6. Step 6: Final answer
    x = 367.75

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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.