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Finding the Fourth Proportional to 393.70, 539.27 and 392.62

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Solution

The fourth proportional to 393.70, 539.27 and 392.62 is: 537.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.70 : 539.27 = 392.62 : x
  2. Step 2: Convert to fraction form
    393.70/539.27 = 392.62/x
  3. Step 3: Cross multiply
    393.70x = 539.27 × 392.62
  4. Step 4: Simplify right side
    393.70x = 211,728.19
  5. Step 5: Solve for x
    x = 211,728.19/393.70
  6. Step 6: Final answer
    x = 537.79

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.