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Finding the Fourth Proportional to 1,908.42, 2,861.81 and 868.11

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Solution

The fourth proportional to 1,908.42, 2,861.81 and 868.11 is: 1,301.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,908.42 : 2,861.81 = 868.11 : x
  2. Step 2: Convert to fraction form
    1,908.42/2,861.81 = 868.11/x
  3. Step 3: Cross multiply
    1,908.42x = 2,861.81 × 868.11
  4. Step 4: Simplify right side
    1,908.42x = 2,484,365.88
  5. Step 5: Solve for x
    x = 2,484,365.88/1,908.42
  6. Step 6: Final answer
    x = 1,301.79

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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.