Home / 1,385.65-1,912.41-1,340.09

Finding the Fourth Proportional to 1,385.65, 1,912.41 and 1,340.09

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Solution

The fourth proportional to 1,385.65, 1,912.41 and 1,340.09 is: 1,849.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,385.65 : 1,912.41 = 1,340.09 : x
  2. Step 2: Convert to fraction form
    1,385.65/1,912.41 = 1,340.09/x
  3. Step 3: Cross multiply
    1,385.65x = 1,912.41 × 1,340.09
  4. Step 4: Simplify right side
    1,385.65x = 2,562,791.95
  5. Step 5: Solve for x
    x = 2,562,791.95/1,385.65
  6. Step 6: Final answer
    x = 1,849.53

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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.