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Finding the Fourth Proportional to 392.63, 544.24 and 386.09

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Solution

The fourth proportional to 392.63, 544.24 and 386.09 is: 535.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.63 : 544.24 = 386.09 : x
  2. Step 2: Convert to fraction form
    392.63/544.24 = 386.09/x
  3. Step 3: Cross multiply
    392.63x = 544.24 × 386.09
  4. Step 4: Simplify right side
    392.63x = 210,123.98
  5. Step 5: Solve for x
    x = 210,123.98/392.63
  6. Step 6: Final answer
    x = 535.18

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.