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Finding the Fourth Proportional to 792.88, 1,189.40 and 215.84

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Solution

The fourth proportional to 792.88, 1,189.40 and 215.84 is: 323.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    792.88 : 1,189.40 = 215.84 : x
  2. Step 2: Convert to fraction form
    792.88/1,189.40 = 215.84/x
  3. Step 3: Cross multiply
    792.88x = 1,189.40 × 215.84
  4. Step 4: Simplify right side
    792.88x = 256,720.10
  5. Step 5: Solve for x
    x = 256,720.10/792.88
  6. Step 6: Final answer
    x = 323.78

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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.