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Finding the Fourth Proportional to 1,085.94, 1,628.46 and 911.79

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Solution

The fourth proportional to 1,085.94, 1,628.46 and 911.79 is: 1,367.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,085.94 : 1,628.46 = 911.79 : x
  2. Step 2: Convert to fraction form
    1,085.94/1,628.46 = 911.79/x
  3. Step 3: Cross multiply
    1,085.94x = 1,628.46 × 911.79
  4. Step 4: Simplify right side
    1,085.94x = 1,484,813.54
  5. Step 5: Solve for x
    x = 1,484,813.54/1,085.94
  6. Step 6: Final answer
    x = 1,367.31

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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.