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Finding the Fourth Proportional to 393.89, 543.36 and 228.07

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Solution

The fourth proportional to 393.89, 543.36 and 228.07 is: 314.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.89 : 543.36 = 228.07 : x
  2. Step 2: Convert to fraction form
    393.89/543.36 = 228.07/x
  3. Step 3: Cross multiply
    393.89x = 543.36 × 228.07
  4. Step 4: Simplify right side
    393.89x = 123,921.31
  5. Step 5: Solve for x
    x = 123,921.31/393.89
  6. Step 6: Final answer
    x = 314.61

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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.