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Finding the Fourth Proportional to 1,121.01, 1,679.83 and 813.54

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Solution

The fourth proportional to 1,121.01, 1,679.83 and 813.54 is: 1,219.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,121.01 : 1,679.83 = 813.54 : x
  2. Step 2: Convert to fraction form
    1,121.01/1,679.83 = 813.54/x
  3. Step 3: Cross multiply
    1,121.01x = 1,679.83 × 813.54
  4. Step 4: Simplify right side
    1,121.01x = 1,366,608.90
  5. Step 5: Solve for x
    x = 1,366,608.90/1,121.01
  6. Step 6: Final answer
    x = 1,219.09

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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.