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Finding the Fourth Proportional to 1,979.35, 2,969.18 and 663.11

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Solution

The fourth proportional to 1,979.35, 2,969.18 and 663.11 is: 994.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,979.35 : 2,969.18 = 663.11 : x
  2. Step 2: Convert to fraction form
    1,979.35/2,969.18 = 663.11/x
  3. Step 3: Cross multiply
    1,979.35x = 2,969.18 × 663.11
  4. Step 4: Simplify right side
    1,979.35x = 1,968,878.10
  5. Step 5: Solve for x
    x = 1,968,878.10/1,979.35
  6. Step 6: Final answer
    x = 994.71

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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.