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Finding the Fourth Proportional to 1,979.09, 2,969 and 662.72

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Solution

The fourth proportional to 1,979.09, 2,969 and 662.72 is: 994.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,979.09 : 2,969 = 662.72 : x
  2. Step 2: Convert to fraction form
    1,979.09/2,969 = 662.72/x
  3. Step 3: Cross multiply
    1,979.09x = 2,969 × 662.72
  4. Step 4: Simplify right side
    1,979.09x = 1,967,615.68
  5. Step 5: Solve for x
    x = 1,967,615.68/1,979.09
  6. Step 6: Final answer
    x = 994.20

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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.