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Finding the Fourth Proportional to 394.85, 544.49 and 385.91

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Solution

The fourth proportional to 394.85, 544.49 and 385.91 is: 532.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    394.85 : 544.49 = 385.91 : x
  2. Step 2: Convert to fraction form
    394.85/544.49 = 385.91/x
  3. Step 3: Cross multiply
    394.85x = 544.49 × 385.91
  4. Step 4: Simplify right side
    394.85x = 210,122.21
  5. Step 5: Solve for x
    x = 210,122.21/394.85
  6. Step 6: Final answer
    x = 532.16

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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.