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Finding the Fourth Proportional to 399.96, 551.90 and 225.30

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Solution

The fourth proportional to 399.96, 551.90 and 225.30 is: 310.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.96 : 551.90 = 225.30 : x
  2. Step 2: Convert to fraction form
    399.96/551.90 = 225.30/x
  3. Step 3: Cross multiply
    399.96x = 551.90 × 225.30
  4. Step 4: Simplify right side
    399.96x = 124,343.07
  5. Step 5: Solve for x
    x = 124,343.07/399.96
  6. Step 6: Final answer
    x = 310.89

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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.