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Finding the Fourth Proportional to 399.41, 551.43 and 305.98

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Solution

The fourth proportional to 399.41, 551.43 and 305.98 is: 422.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.41 : 551.43 = 305.98 : x
  2. Step 2: Convert to fraction form
    399.41/551.43 = 305.98/x
  3. Step 3: Cross multiply
    399.41x = 551.43 × 305.98
  4. Step 4: Simplify right side
    399.41x = 168,726.03
  5. Step 5: Solve for x
    x = 168,726.03/399.41
  6. Step 6: Final answer
    x = 422.44

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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.