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Finding the Fourth Proportional to 1,979.64, 2,969.48 and 681.12

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Solution

The fourth proportional to 1,979.64, 2,969.48 and 681.12 is: 1,021.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,979.64 : 2,969.48 = 681.12 : x
  2. Step 2: Convert to fraction form
    1,979.64/2,969.48 = 681.12/x
  3. Step 3: Cross multiply
    1,979.64x = 2,969.48 × 681.12
  4. Step 4: Simplify right side
    1,979.64x = 2,022,572.22
  5. Step 5: Solve for x
    x = 2,022,572.22/1,979.64
  6. Step 6: Final answer
    x = 1,021.69

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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.