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Finding the Fourth Proportional to 3,168.66, 4,749.80 and 1,320.80

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Solution

The fourth proportional to 3,168.66, 4,749.80 and 1,320.80 is: 1,979.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,168.66 : 4,749.80 = 1,320.80 : x
  2. Step 2: Convert to fraction form
    3,168.66/4,749.80 = 1,320.80/x
  3. Step 3: Cross multiply
    3,168.66x = 4,749.80 × 1,320.80
  4. Step 4: Simplify right side
    3,168.66x = 6,273,505.49
  5. Step 5: Solve for x
    x = 6,273,505.49/3,168.66
  6. Step 6: Final answer
    x = 1,979.86

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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.