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Finding the Fourth Proportional to 1,990.25, 2,982.79 and 818.93

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Solution

The fourth proportional to 1,990.25, 2,982.79 and 818.93 is: 1,227.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,990.25 : 2,982.79 = 818.93 : x
  2. Step 2: Convert to fraction form
    1,990.25/2,982.79 = 818.93/x
  3. Step 3: Cross multiply
    1,990.25x = 2,982.79 × 818.93
  4. Step 4: Simplify right side
    1,990.25x = 2,442,696.21
  5. Step 5: Solve for x
    x = 2,442,696.21/1,990.25
  6. Step 6: Final answer
    x = 1,227.33

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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.