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Finding the Fourth Proportional to 1,986.37, 2,979.68 and 670.25

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Solution

The fourth proportional to 1,986.37, 2,979.68 and 670.25 is: 1,005.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,986.37 : 2,979.68 = 670.25 : x
  2. Step 2: Convert to fraction form
    1,986.37/2,979.68 = 670.25/x
  3. Step 3: Cross multiply
    1,986.37x = 2,979.68 × 670.25
  4. Step 4: Simplify right side
    1,986.37x = 1,997,134.62
  5. Step 5: Solve for x
    x = 1,997,134.62/1,986.37
  6. Step 6: Final answer
    x = 1,005.42

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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.