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Finding the Fourth Proportional to 399.55, 551.37 and 330.16

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Solution

The fourth proportional to 399.55, 551.37 and 330.16 is: 455.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.55 : 551.37 = 330.16 : x
  2. Step 2: Convert to fraction form
    399.55/551.37 = 330.16/x
  3. Step 3: Cross multiply
    399.55x = 551.37 × 330.16
  4. Step 4: Simplify right side
    399.55x = 182,040.32
  5. Step 5: Solve for x
    x = 182,040.32/399.55
  6. Step 6: Final answer
    x = 455.61

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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.