Home / 1,912.86-2,639.58-1,126.80

Finding the Fourth Proportional to 1,912.86, 2,639.58 and 1,126.80

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Solution

The fourth proportional to 1,912.86, 2,639.58 and 1,126.80 is: 1,554.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,912.86 : 2,639.58 = 1,126.80 : x
  2. Step 2: Convert to fraction form
    1,912.86/2,639.58 = 1,126.80/x
  3. Step 3: Cross multiply
    1,912.86x = 2,639.58 × 1,126.80
  4. Step 4: Simplify right side
    1,912.86x = 2,974,278.74
  5. Step 5: Solve for x
    x = 2,974,278.74/1,912.86
  6. Step 6: Final answer
    x = 1,554.89

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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.