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Finding the Fourth Proportional to 1,385, 1,912.92 and 918.44

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Solution

The fourth proportional to 1,385, 1,912.92 and 918.44 is: 1,268.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,385 : 1,912.92 = 918.44 : x
  2. Step 2: Convert to fraction form
    1,385/1,912.92 = 918.44/x
  3. Step 3: Cross multiply
    1,385x = 1,912.92 × 918.44
  4. Step 4: Simplify right side
    1,385x = 1,756,902.24
  5. Step 5: Solve for x
    x = 1,756,902.24/1,385
  6. Step 6: Final answer
    x = 1,268.52

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.