Home / 1,911.98-2,638.45-1,115.33

Finding the Fourth Proportional to 1,911.98, 2,638.45 and 1,115.33

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Solution

The fourth proportional to 1,911.98, 2,638.45 and 1,115.33 is: 1,539.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,911.98 : 2,638.45 = 1,115.33 : x
  2. Step 2: Convert to fraction form
    1,911.98/2,638.45 = 1,115.33/x
  3. Step 3: Cross multiply
    1,911.98x = 2,638.45 × 1,115.33
  4. Step 4: Simplify right side
    1,911.98x = 2,942,742.44
  5. Step 5: Solve for x
    x = 2,942,742.44/1,911.98
  6. Step 6: Final answer
    x = 1,539.11

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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.