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Finding the Fourth Proportional to 1,979.88, 2,968.82 and 663.17

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Solution

The fourth proportional to 1,979.88, 2,968.82 and 663.17 is: 994.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,979.88 : 2,968.82 = 663.17 : x
  2. Step 2: Convert to fraction form
    1,979.88/2,968.82 = 663.17/x
  3. Step 3: Cross multiply
    1,979.88x = 2,968.82 × 663.17
  4. Step 4: Simplify right side
    1,979.88x = 1,968,841.44
  5. Step 5: Solve for x
    x = 1,968,841.44/1,979.88
  6. Step 6: Final answer
    x = 994.42

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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.