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Finding the Fourth Proportional to 1,320.89, 1,979.09 and 799.31

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Solution

The fourth proportional to 1,320.89, 1,979.09 and 799.31 is: 1,197.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,320.89 : 1,979.09 = 799.31 : x
  2. Step 2: Convert to fraction form
    1,320.89/1,979.09 = 799.31/x
  3. Step 3: Cross multiply
    1,320.89x = 1,979.09 × 799.31
  4. Step 4: Simplify right side
    1,320.89x = 1,581,905.81
  5. Step 5: Solve for x
    x = 1,581,905.81/1,320.89
  6. Step 6: Final answer
    x = 1,197.61

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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.