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Finding the Fourth Proportional to 1,986.23, 2,979.33 and 816.03

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Solution

The fourth proportional to 1,986.23, 2,979.33 and 816.03 is: 1,224.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,986.23 : 2,979.33 = 816.03 : x
  2. Step 2: Convert to fraction form
    1,986.23/2,979.33 = 816.03/x
  3. Step 3: Cross multiply
    1,986.23x = 2,979.33 × 816.03
  4. Step 4: Simplify right side
    1,986.23x = 2,431,222.66
  5. Step 5: Solve for x
    x = 2,431,222.66/1,986.23
  6. Step 6: Final answer
    x = 1,224.04

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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.