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Finding the Fourth Proportional to 426.42, 639.02 and 194.74

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Solution

The fourth proportional to 426.42, 639.02 and 194.74 is: 291.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    426.42 : 639.02 = 194.74 : x
  2. Step 2: Convert to fraction form
    426.42/639.02 = 194.74/x
  3. Step 3: Cross multiply
    426.42x = 639.02 × 194.74
  4. Step 4: Simplify right side
    426.42x = 124,441.64
  5. Step 5: Solve for x
    x = 124,441.64/426.42
  6. Step 6: Final answer
    x = 291.83

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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.