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Finding the Fourth Proportional to 1,449.11, 1,999.11 and 859.31

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Solution

The fourth proportional to 1,449.11, 1,999.11 and 859.31 is: 1,185.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,449.11 : 1,999.11 = 859.31 : x
  2. Step 2: Convert to fraction form
    1,449.11/1,999.11 = 859.31/x
  3. Step 3: Cross multiply
    1,449.11x = 1,999.11 × 859.31
  4. Step 4: Simplify right side
    1,449.11x = 1,717,855.21
  5. Step 5: Solve for x
    x = 1,717,855.21/1,449.11
  6. Step 6: Final answer
    x = 1,185.46

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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.