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Finding the Fourth Proportional to 808.28, 1,212.90 and 423.56

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Solution

The fourth proportional to 808.28, 1,212.90 and 423.56 is: 635.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    808.28 : 1,212.90 = 423.56 : x
  2. Step 2: Convert to fraction form
    808.28/1,212.90 = 423.56/x
  3. Step 3: Cross multiply
    808.28x = 1,212.90 × 423.56
  4. Step 4: Simplify right side
    808.28x = 513,735.92
  5. Step 5: Solve for x
    x = 513,735.92/808.28
  6. Step 6: Final answer
    x = 635.59

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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.