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Finding the Fourth Proportional to 399.52, 551.13 and 274.96

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Solution

The fourth proportional to 399.52, 551.13 and 274.96 is: 379.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.52 : 551.13 = 274.96 : x
  2. Step 2: Convert to fraction form
    399.52/551.13 = 274.96/x
  3. Step 3: Cross multiply
    399.52x = 551.13 × 274.96
  4. Step 4: Simplify right side
    399.52x = 151,538.70
  5. Step 5: Solve for x
    x = 151,538.70/399.52
  6. Step 6: Final answer
    x = 379.30

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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.