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Finding the Fourth Proportional to 392.43, 585.78 and 363.87

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Solution

The fourth proportional to 392.43, 585.78 and 363.87 is: 543.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.43 : 585.78 = 363.87 : x
  2. Step 2: Convert to fraction form
    392.43/585.78 = 363.87/x
  3. Step 3: Cross multiply
    392.43x = 585.78 × 363.87
  4. Step 4: Simplify right side
    392.43x = 213,147.77
  5. Step 5: Solve for x
    x = 213,147.77/392.43
  6. Step 6: Final answer
    x = 543.15

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.