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Finding the Fourth Proportional to 792.08, 1,185.88 and 687.44

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Solution

The fourth proportional to 792.08, 1,185.88 and 687.44 is: 1,029.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    792.08 : 1,185.88 = 687.44 : x
  2. Step 2: Convert to fraction form
    792.08/1,185.88 = 687.44/x
  3. Step 3: Cross multiply
    792.08x = 1,185.88 × 687.44
  4. Step 4: Simplify right side
    792.08x = 815,221.35
  5. Step 5: Solve for x
    x = 815,221.35/792.08
  6. Step 6: Final answer
    x = 1,029.22

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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.