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Finding the Fourth Proportional to 1,979.64, 2,731.92 and 1,383

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Solution

The fourth proportional to 1,979.64, 2,731.92 and 1,383 is: 1,908.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,979.64 : 2,731.92 = 1,383 : x
  2. Step 2: Convert to fraction form
    1,979.64/2,731.92 = 1,383/x
  3. Step 3: Cross multiply
    1,979.64x = 2,731.92 × 1,383
  4. Step 4: Simplify right side
    1,979.64x = 3,778,245.36
  5. Step 5: Solve for x
    x = 3,778,245.36/1,979.64
  6. Step 6: Final answer
    x = 1,908.55

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.