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Finding the Fourth Proportional to 1,986.26, 2,979.71 and 670.14

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Solution

The fourth proportional to 1,986.26, 2,979.71 and 670.14 is: 1,005.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,986.26 : 2,979.71 = 670.14 : x
  2. Step 2: Convert to fraction form
    1,986.26/2,979.71 = 670.14/x
  3. Step 3: Cross multiply
    1,986.26x = 2,979.71 × 670.14
  4. Step 4: Simplify right side
    1,986.26x = 1,996,807.96
  5. Step 5: Solve for x
    x = 1,996,807.96/1,986.26
  6. Step 6: Final answer
    x = 1,005.31

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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.