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Finding the Fourth Proportional to 399.89, 551.59 and 275.56

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Solution

The fourth proportional to 399.89, 551.59 and 275.56 is: 380.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.89 : 551.59 = 275.56 : x
  2. Step 2: Convert to fraction form
    399.89/551.59 = 275.56/x
  3. Step 3: Cross multiply
    399.89x = 551.59 × 275.56
  4. Step 4: Simplify right side
    399.89x = 151,996.14
  5. Step 5: Solve for x
    x = 151,996.14/399.89
  6. Step 6: Final answer
    x = 380.09

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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.