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Finding the Fourth Proportional to 1,986.13, 2,978.12 and 669.44

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Solution

The fourth proportional to 1,986.13, 2,978.12 and 669.44 is: 1,003.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,986.13 : 2,978.12 = 669.44 : x
  2. Step 2: Convert to fraction form
    1,986.13/2,978.12 = 669.44/x
  3. Step 3: Cross multiply
    1,986.13x = 2,978.12 × 669.44
  4. Step 4: Simplify right side
    1,986.13x = 1,993,672.65
  5. Step 5: Solve for x
    x = 1,993,672.65/1,986.13
  6. Step 6: Final answer
    x = 1,003.80

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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.