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Finding the Fourth Proportional to 792.89, 1,189.34 and 215.76

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Solution

The fourth proportional to 792.89, 1,189.34 and 215.76 is: 323.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    792.89 : 1,189.34 = 215.76 : x
  2. Step 2: Convert to fraction form
    792.89/1,189.34 = 215.76/x
  3. Step 3: Cross multiply
    792.89x = 1,189.34 × 215.76
  4. Step 4: Simplify right side
    792.89x = 256,610.92
  5. Step 5: Solve for x
    x = 256,610.92/792.89
  6. Step 6: Final answer
    x = 323.64

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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.