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Finding the Fourth Proportional to 1,789.85, 2,685.94 and 815.96

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Solution

The fourth proportional to 1,789.85, 2,685.94 and 815.96 is: 1,224.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,789.85 : 2,685.94 = 815.96 : x
  2. Step 2: Convert to fraction form
    1,789.85/2,685.94 = 815.96/x
  3. Step 3: Cross multiply
    1,789.85x = 2,685.94 × 815.96
  4. Step 4: Simplify right side
    1,789.85x = 2,191,619.60
  5. Step 5: Solve for x
    x = 2,191,619.60/1,789.85
  6. Step 6: Final answer
    x = 1,224.47

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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.