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Finding the Fourth Proportional to 1,910.81, 2,864.39 and 813.66

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Solution

The fourth proportional to 1,910.81, 2,864.39 and 813.66 is: 1,219.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,910.81 : 2,864.39 = 813.66 : x
  2. Step 2: Convert to fraction form
    1,910.81/2,864.39 = 813.66/x
  3. Step 3: Cross multiply
    1,910.81x = 2,864.39 × 813.66
  4. Step 4: Simplify right side
    1,910.81x = 2,330,635.50
  5. Step 5: Solve for x
    x = 2,330,635.50/1,910.81
  6. Step 6: Final answer
    x = 1,219.71

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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.