Home / 1,945.19-2,915.70-1,121.75

Finding the Fourth Proportional to 1,945.19, 2,915.70 and 1,121.75

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Solution

The fourth proportional to 1,945.19, 2,915.70 and 1,121.75 is: 1,681.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,945.19 : 2,915.70 = 1,121.75 : x
  2. Step 2: Convert to fraction form
    1,945.19/2,915.70 = 1,121.75/x
  3. Step 3: Cross multiply
    1,945.19x = 2,915.70 × 1,121.75
  4. Step 4: Simplify right side
    1,945.19x = 3,270,671.90
  5. Step 5: Solve for x
    x = 3,270,671.90/1,945.19
  6. Step 6: Final answer
    x = 1,681.42

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.