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Finding the Fourth Proportional to 399.81, 551.96 and 300.78

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Solution

The fourth proportional to 399.81, 551.96 and 300.78 is: 415.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.81 : 551.96 = 300.78 : x
  2. Step 2: Convert to fraction form
    399.81/551.96 = 300.78/x
  3. Step 3: Cross multiply
    399.81x = 551.96 × 300.78
  4. Step 4: Simplify right side
    399.81x = 166,018.53
  5. Step 5: Solve for x
    x = 166,018.53/399.81
  6. Step 6: Final answer
    x = 415.24

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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.