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Finding the Fourth Proportional to 835.21, 1,251.75 and 423.63

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Solution

The fourth proportional to 835.21, 1,251.75 and 423.63 is: 634.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    835.21 : 1,251.75 = 423.63 : x
  2. Step 2: Convert to fraction form
    835.21/1,251.75 = 423.63/x
  3. Step 3: Cross multiply
    835.21x = 1,251.75 × 423.63
  4. Step 4: Simplify right side
    835.21x = 530,280.44
  5. Step 5: Solve for x
    x = 530,280.44/835.21
  6. Step 6: Final answer
    x = 634.91

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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.