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Finding the Fourth Proportional to 1,911.39, 2,867.69 and 871.35

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Solution

The fourth proportional to 1,911.39, 2,867.69 and 871.35 is: 1,307.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,911.39 : 2,867.69 = 871.35 : x
  2. Step 2: Convert to fraction form
    1,911.39/2,867.69 = 871.35/x
  3. Step 3: Cross multiply
    1,911.39x = 2,867.69 × 871.35
  4. Step 4: Simplify right side
    1,911.39x = 2,498,761.68
  5. Step 5: Solve for x
    x = 2,498,761.68/1,911.39
  6. Step 6: Final answer
    x = 1,307.30

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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.