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Finding the Fourth Proportional to 394.00, 543.51 and 254.21

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Solution

The fourth proportional to 394.00, 543.51 and 254.21 is: 350.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    394.00 : 543.51 = 254.21 : x
  2. Step 2: Convert to fraction form
    394.00/543.51 = 254.21/x
  3. Step 3: Cross multiply
    394.00x = 543.51 × 254.21
  4. Step 4: Simplify right side
    394.00x = 138,162.96
  5. Step 5: Solve for x
    x = 138,162.96/394.00
  6. Step 6: Final answer
    x = 350.67

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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.