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Finding the Fourth Proportional to 399.47, 551.41 and 301.46

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Solution

The fourth proportional to 399.47, 551.41 and 301.46 is: 416.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.47 : 551.41 = 301.46 : x
  2. Step 2: Convert to fraction form
    399.47/551.41 = 301.46/x
  3. Step 3: Cross multiply
    399.47x = 551.41 × 301.46
  4. Step 4: Simplify right side
    399.47x = 166,224.55
  5. Step 5: Solve for x
    x = 166,224.55/399.47
  6. Step 6: Final answer
    x = 416.12

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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.