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Finding the Fourth Proportional to 394.68, 543.78 and 377.40

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Solution

The fourth proportional to 394.68, 543.78 and 377.40 is: 519.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    394.68 : 543.78 = 377.40 : x
  2. Step 2: Convert to fraction form
    394.68/543.78 = 377.40/x
  3. Step 3: Cross multiply
    394.68x = 543.78 × 377.40
  4. Step 4: Simplify right side
    394.68x = 205,222.57
  5. Step 5: Solve for x
    x = 205,222.57/394.68
  6. Step 6: Final answer
    x = 519.97

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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.