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Finding the Fourth Proportional to 393.44, 543.12 and 306.56

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Solution

The fourth proportional to 393.44, 543.12 and 306.56 is: 423.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.44 : 543.12 = 306.56 : x
  2. Step 2: Convert to fraction form
    393.44/543.12 = 306.56/x
  3. Step 3: Cross multiply
    393.44x = 543.12 × 306.56
  4. Step 4: Simplify right side
    393.44x = 166,498.87
  5. Step 5: Solve for x
    x = 166,498.87/393.44
  6. Step 6: Final answer
    x = 423.19

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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.