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Finding the Fourth Proportional to 1,992.30, 2,986.68 and 758.88

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Solution

The fourth proportional to 1,992.30, 2,986.68 and 758.88 is: 1,137.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,992.30 : 2,986.68 = 758.88 : x
  2. Step 2: Convert to fraction form
    1,992.30/2,986.68 = 758.88/x
  3. Step 3: Cross multiply
    1,992.30x = 2,986.68 × 758.88
  4. Step 4: Simplify right side
    1,992.30x = 2,266,531.72
  5. Step 5: Solve for x
    x = 2,266,531.72/1,992.30
  6. Step 6: Final answer
    x = 1,137.65

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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.