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Finding the Fourth Proportional to 1,986.18, 2,979.62 and 670.06

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Solution

The fourth proportional to 1,986.18, 2,979.62 and 670.06 is: 1,005.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,986.18 : 2,979.62 = 670.06 : x
  2. Step 2: Convert to fraction form
    1,986.18/2,979.62 = 670.06/x
  3. Step 3: Cross multiply
    1,986.18x = 2,979.62 × 670.06
  4. Step 4: Simplify right side
    1,986.18x = 1,996,524.18
  5. Step 5: Solve for x
    x = 1,996,524.18/1,986.18
  6. Step 6: Final answer
    x = 1,005.21

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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.