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Finding the Fourth Proportional to 1,449.36, 1,999.44 and 859.89

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Solution

The fourth proportional to 1,449.36, 1,999.44 and 859.89 is: 1,186.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,449.36 : 1,999.44 = 859.89 : x
  2. Step 2: Convert to fraction form
    1,449.36/1,999.44 = 859.89/x
  3. Step 3: Cross multiply
    1,449.36x = 1,999.44 × 859.89
  4. Step 4: Simplify right side
    1,449.36x = 1,719,298.46
  5. Step 5: Solve for x
    x = 1,719,298.46/1,449.36
  6. Step 6: Final answer
    x = 1,186.25

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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.