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Finding the Fourth Proportional to 399.69, 551.61 and 252.51

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Solution

The fourth proportional to 399.69, 551.61 and 252.51 is: 348.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.69 : 551.61 = 252.51 : x
  2. Step 2: Convert to fraction form
    399.69/551.61 = 252.51/x
  3. Step 3: Cross multiply
    399.69x = 551.61 × 252.51
  4. Step 4: Simplify right side
    399.69x = 139,287.04
  5. Step 5: Solve for x
    x = 139,287.04/399.69
  6. Step 6: Final answer
    x = 348.49

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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.