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Finding the Fourth Proportional to 1,811.94, 2,716.79 and 641.79

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Solution

The fourth proportional to 1,811.94, 2,716.79 and 641.79 is: 962.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,811.94 : 2,716.79 = 641.79 : x
  2. Step 2: Convert to fraction form
    1,811.94/2,716.79 = 641.79/x
  3. Step 3: Cross multiply
    1,811.94x = 2,716.79 × 641.79
  4. Step 4: Simplify right side
    1,811.94x = 1,743,605.45
  5. Step 5: Solve for x
    x = 1,743,605.45/1,811.94
  6. Step 6: Final answer
    x = 962.29

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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.