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Finding the Fourth Proportional to 393.15, 588.81 and 228.21

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Solution

The fourth proportional to 393.15, 588.81 and 228.21 is: 341.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.15 : 588.81 = 228.21 : x
  2. Step 2: Convert to fraction form
    393.15/588.81 = 228.21/x
  3. Step 3: Cross multiply
    393.15x = 588.81 × 228.21
  4. Step 4: Simplify right side
    393.15x = 134,370.98
  5. Step 5: Solve for x
    x = 134,370.98/393.15
  6. Step 6: Final answer
    x = 341.78

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.