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Finding the Fourth Proportional to 792.94, 1,189.44 and 215.81

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Solution

The fourth proportional to 792.94, 1,189.44 and 215.81 is: 323.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    792.94 : 1,189.44 = 215.81 : x
  2. Step 2: Convert to fraction form
    792.94/1,189.44 = 215.81/x
  3. Step 3: Cross multiply
    792.94x = 1,189.44 × 215.81
  4. Step 4: Simplify right side
    792.94x = 256,696.02
  5. Step 5: Solve for x
    x = 256,696.02/792.94
  6. Step 6: Final answer
    x = 323.73

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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.