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Finding the Fourth Proportional to 1,986.49, 2,979.82 and 670.28

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Solution

The fourth proportional to 1,986.49, 2,979.82 and 670.28 is: 1,005.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,986.49 : 2,979.82 = 670.28 : x
  2. Step 2: Convert to fraction form
    1,986.49/2,979.82 = 670.28/x
  3. Step 3: Cross multiply
    1,986.49x = 2,979.82 × 670.28
  4. Step 4: Simplify right side
    1,986.49x = 1,997,299.69
  5. Step 5: Solve for x
    x = 1,997,299.69/1,986.49
  6. Step 6: Final answer
    x = 1,005.44

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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.