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Finding the Fourth Proportional to 392.30, 539.42 and 380.16

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Solution

The fourth proportional to 392.30, 539.42 and 380.16 is: 522.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.30 : 539.42 = 380.16 : x
  2. Step 2: Convert to fraction form
    392.30/539.42 = 380.16/x
  3. Step 3: Cross multiply
    392.30x = 539.42 × 380.16
  4. Step 4: Simplify right side
    392.30x = 205,065.91
  5. Step 5: Solve for x
    x = 205,065.91/392.30
  6. Step 6: Final answer
    x = 522.73

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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.