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Finding the Fourth Proportional to 1,287.43, 1,932.09 and 995.65

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Solution

The fourth proportional to 1,287.43, 1,932.09 and 995.65 is: 1,494.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,287.43 : 1,932.09 = 995.65 : x
  2. Step 2: Convert to fraction form
    1,287.43/1,932.09 = 995.65/x
  3. Step 3: Cross multiply
    1,287.43x = 1,932.09 × 995.65
  4. Step 4: Simplify right side
    1,287.43x = 1,923,676.84
  5. Step 5: Solve for x
    x = 1,923,676.84/1,287.43
  6. Step 6: Final answer
    x = 1,494.20

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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.