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Finding the Fourth Proportional to 399.39, 551.28 and 233.64

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Solution

The fourth proportional to 399.39, 551.28 and 233.64 is: 322.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.39 : 551.28 = 233.64 : x
  2. Step 2: Convert to fraction form
    399.39/551.28 = 233.64/x
  3. Step 3: Cross multiply
    399.39x = 551.28 × 233.64
  4. Step 4: Simplify right side
    399.39x = 128,801.06
  5. Step 5: Solve for x
    x = 128,801.06/399.39
  6. Step 6: Final answer
    x = 322.49

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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.