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Finding the Fourth Proportional to 1,979.05, 2,968.62 and 680.50

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Solution

The fourth proportional to 1,979.05, 2,968.62 and 680.50 is: 1,020.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,979.05 : 2,968.62 = 680.50 : x
  2. Step 2: Convert to fraction form
    1,979.05/2,968.62 = 680.50/x
  3. Step 3: Cross multiply
    1,979.05x = 2,968.62 × 680.50
  4. Step 4: Simplify right side
    1,979.05x = 2,020,145.91
  5. Step 5: Solve for x
    x = 2,020,145.91/1,979.05
  6. Step 6: Final answer
    x = 1,020.77

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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.