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Finding the Fourth Proportional to 402.36, 555.20 and 227.72

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Solution

The fourth proportional to 402.36, 555.20 and 227.72 is: 314.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    402.36 : 555.20 = 227.72 : x
  2. Step 2: Convert to fraction form
    402.36/555.20 = 227.72/x
  3. Step 3: Cross multiply
    402.36x = 555.20 × 227.72
  4. Step 4: Simplify right side
    402.36x = 126,430.14
  5. Step 5: Solve for x
    x = 126,430.14/402.36
  6. Step 6: Final answer
    x = 314.22

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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.