Home / 1,912.32-2,638.89-1,115.55

Finding the Fourth Proportional to 1,912.32, 2,638.89 and 1,115.55

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Solution

The fourth proportional to 1,912.32, 2,638.89 and 1,115.55 is: 1,539.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,912.32 : 2,638.89 = 1,115.55 : x
  2. Step 2: Convert to fraction form
    1,912.32/2,638.89 = 1,115.55/x
  3. Step 3: Cross multiply
    1,912.32x = 2,638.89 × 1,115.55
  4. Step 4: Simplify right side
    1,912.32x = 2,943,813.74
  5. Step 5: Solve for x
    x = 2,943,813.74/1,912.32
  6. Step 6: Final answer
    x = 1,539.39

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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.