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Finding the Fourth Proportional to 1,986.49, 2,979.34 and 670.12

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Solution

The fourth proportional to 1,986.49, 2,979.34 and 670.12 is: 1,005.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,986.49 : 2,979.34 = 670.12 : x
  2. Step 2: Convert to fraction form
    1,986.49/2,979.34 = 670.12/x
  3. Step 3: Cross multiply
    1,986.49x = 2,979.34 × 670.12
  4. Step 4: Simplify right side
    1,986.49x = 1,996,500.42
  5. Step 5: Solve for x
    x = 1,996,500.42/1,986.49
  6. Step 6: Final answer
    x = 1,005.04

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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.