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Finding the Fourth Proportional to 393.87, 543.72 and 246.72

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Solution

The fourth proportional to 393.87, 543.72 and 246.72 is: 340.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.87 : 543.72 = 246.72 : x
  2. Step 2: Convert to fraction form
    393.87/543.72 = 246.72/x
  3. Step 3: Cross multiply
    393.87x = 543.72 × 246.72
  4. Step 4: Simplify right side
    393.87x = 134,146.60
  5. Step 5: Solve for x
    x = 134,146.60/393.87
  6. Step 6: Final answer
    x = 340.59

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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.