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Finding the Fourth Proportional to 399.48, 551 and 266.70

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Solution

The fourth proportional to 399.48, 551 and 266.70 is: 367.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.48 : 551 = 266.70 : x
  2. Step 2: Convert to fraction form
    399.48/551 = 266.70/x
  3. Step 3: Cross multiply
    399.48x = 551 × 266.70
  4. Step 4: Simplify right side
    399.48x = 146,951.70
  5. Step 5: Solve for x
    x = 146,951.70/399.48
  6. Step 6: Final answer
    x = 367.86

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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.