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Finding the Fourth Proportional to 394.78, 543.61 and 371.69

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Solution

The fourth proportional to 394.78, 543.61 and 371.69 is: 511.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    394.78 : 543.61 = 371.69 : x
  2. Step 2: Convert to fraction form
    394.78/543.61 = 371.69/x
  3. Step 3: Cross multiply
    394.78x = 543.61 × 371.69
  4. Step 4: Simplify right side
    394.78x = 202,054.40
  5. Step 5: Solve for x
    x = 202,054.40/394.78
  6. Step 6: Final answer
    x = 511.82

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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.