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Finding the Fourth Proportional to 393.31, 543.07 and 246.21

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Solution

The fourth proportional to 393.31, 543.07 and 246.21 is: 339.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.31 : 543.07 = 246.21 : x
  2. Step 2: Convert to fraction form
    393.31/543.07 = 246.21/x
  3. Step 3: Cross multiply
    393.31x = 543.07 × 246.21
  4. Step 4: Simplify right side
    393.31x = 133,709.26
  5. Step 5: Solve for x
    x = 133,709.26/393.31
  6. Step 6: Final answer
    x = 339.96

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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.