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Finding the Fourth Proportional to 2,071.87, 3,108.36 and 839

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Solution

The fourth proportional to 2,071.87, 3,108.36 and 839 is: 1,258.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,071.87 : 3,108.36 = 839 : x
  2. Step 2: Convert to fraction form
    2,071.87/3,108.36 = 839/x
  3. Step 3: Cross multiply
    2,071.87x = 3,108.36 × 839
  4. Step 4: Simplify right side
    2,071.87x = 2,607,914.04
  5. Step 5: Solve for x
    x = 2,607,914.04/2,071.87
  6. Step 6: Final answer
    x = 1,258.72

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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.