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Finding the Fourth Proportional to 426.89, 640.85 and 361.69

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Solution

The fourth proportional to 426.89, 640.85 and 361.69 is: 542.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    426.89 : 640.85 = 361.69 : x
  2. Step 2: Convert to fraction form
    426.89/640.85 = 361.69/x
  3. Step 3: Cross multiply
    426.89x = 640.85 × 361.69
  4. Step 4: Simplify right side
    426.89x = 231,785.63
  5. Step 5: Solve for x
    x = 231,785.63/426.89
  6. Step 6: Final answer
    x = 542.96

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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.