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Finding the Fourth Proportional to 1,449.23, 1,999.91 and 786.09

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Solution

The fourth proportional to 1,449.23, 1,999.91 and 786.09 is: 1,084.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,449.23 : 1,999.91 = 786.09 : x
  2. Step 2: Convert to fraction form
    1,449.23/1,999.91 = 786.09/x
  3. Step 3: Cross multiply
    1,449.23x = 1,999.91 × 786.09
  4. Step 4: Simplify right side
    1,449.23x = 1,572,103.05
  5. Step 5: Solve for x
    x = 1,572,103.05/1,449.23
  6. Step 6: Final answer
    x = 1,084.79

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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.