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Finding the Fourth Proportional to 1,979.82, 2,969.82 and 663.70

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Solution

The fourth proportional to 1,979.82, 2,969.82 and 663.70 is: 995.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,979.82 : 2,969.82 = 663.70 : x
  2. Step 2: Convert to fraction form
    1,979.82/2,969.82 = 663.70/x
  3. Step 3: Cross multiply
    1,979.82x = 2,969.82 × 663.70
  4. Step 4: Simplify right side
    1,979.82x = 1,971,069.53
  5. Step 5: Solve for x
    x = 1,971,069.53/1,979.82
  6. Step 6: Final answer
    x = 995.58

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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.