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Finding the Fourth Proportional to 399.79, 551.72 and 225.13

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Solution

The fourth proportional to 399.79, 551.72 and 225.13 is: 310.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.79 : 551.72 = 225.13 : x
  2. Step 2: Convert to fraction form
    399.79/551.72 = 225.13/x
  3. Step 3: Cross multiply
    399.79x = 551.72 × 225.13
  4. Step 4: Simplify right side
    399.79x = 124,208.72
  5. Step 5: Solve for x
    x = 124,208.72/399.79
  6. Step 6: Final answer
    x = 310.68

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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.