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Finding the Fourth Proportional to 1,911.82, 2,869.06 and 679.22

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Solution

The fourth proportional to 1,911.82, 2,869.06 and 679.22 is: 1,019.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,911.82 : 2,869.06 = 679.22 : x
  2. Step 2: Convert to fraction form
    1,911.82/2,869.06 = 679.22/x
  3. Step 3: Cross multiply
    1,911.82x = 2,869.06 × 679.22
  4. Step 4: Simplify right side
    1,911.82x = 1,948,722.93
  5. Step 5: Solve for x
    x = 1,948,722.93/1,911.82
  6. Step 6: Final answer
    x = 1,019.30

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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.