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Finding the Fourth Proportional to 426.54, 639.22 and 194.85

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Solution

The fourth proportional to 426.54, 639.22 and 194.85 is: 292.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    426.54 : 639.22 = 194.85 : x
  2. Step 2: Convert to fraction form
    426.54/639.22 = 194.85/x
  3. Step 3: Cross multiply
    426.54x = 639.22 × 194.85
  4. Step 4: Simplify right side
    426.54x = 124,552.02
  5. Step 5: Solve for x
    x = 124,552.02/426.54
  6. Step 6: Final answer
    x = 292.01

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.