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Finding the Fourth Proportional to 3,099.71, 4,649.57 and 791.21

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Solution

The fourth proportional to 3,099.71, 4,649.57 and 791.21 is: 1,186.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,099.71 : 4,649.57 = 791.21 : x
  2. Step 2: Convert to fraction form
    3,099.71/4,649.57 = 791.21/x
  3. Step 3: Cross multiply
    3,099.71x = 4,649.57 × 791.21
  4. Step 4: Simplify right side
    3,099.71x = 3,678,786.28
  5. Step 5: Solve for x
    x = 3,678,786.28/3,099.71
  6. Step 6: Final answer
    x = 1,186.82

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Similar ratio
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1.5x scale

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.