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Finding the Fourth Proportional to 399.38, 551.15 and 233.61

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Solution

The fourth proportional to 399.38, 551.15 and 233.61 is: 322.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.38 : 551.15 = 233.61 : x
  2. Step 2: Convert to fraction form
    399.38/551.15 = 233.61/x
  3. Step 3: Cross multiply
    399.38x = 551.15 × 233.61
  4. Step 4: Simplify right side
    399.38x = 128,751.40
  5. Step 5: Solve for x
    x = 128,751.40/399.38
  6. Step 6: Final answer
    x = 322.38

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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.