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Finding the Fourth Proportional to 402.99, 556.13 and 225.97

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Solution

The fourth proportional to 402.99, 556.13 and 225.97 is: 311.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    402.99 : 556.13 = 225.97 : x
  2. Step 2: Convert to fraction form
    402.99/556.13 = 225.97/x
  3. Step 3: Cross multiply
    402.99x = 556.13 × 225.97
  4. Step 4: Simplify right side
    402.99x = 125,668.70
  5. Step 5: Solve for x
    x = 125,668.70/402.99
  6. Step 6: Final answer
    x = 311.84

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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.