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Finding the Fourth Proportional to 402.20, 555.05 and 227.55

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Solution

The fourth proportional to 402.20, 555.05 and 227.55 is: 314.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    402.20 : 555.05 = 227.55 : x
  2. Step 2: Convert to fraction form
    402.20/555.05 = 227.55/x
  3. Step 3: Cross multiply
    402.20x = 555.05 × 227.55
  4. Step 4: Simplify right side
    402.20x = 126,301.63
  5. Step 5: Solve for x
    x = 126,301.63/402.20
  6. Step 6: Final answer
    x = 314.03

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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.