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Finding the Fourth Proportional to 792.82, 1,189.21 and 215.70

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Solution

The fourth proportional to 792.82, 1,189.21 and 215.70 is: 323.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    792.82 : 1,189.21 = 215.70 : x
  2. Step 2: Convert to fraction form
    792.82/1,189.21 = 215.70/x
  3. Step 3: Cross multiply
    792.82x = 1,189.21 × 215.70
  4. Step 4: Simplify right side
    792.82x = 256,512.60
  5. Step 5: Solve for x
    x = 256,512.60/792.82
  6. Step 6: Final answer
    x = 323.54

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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.