Home / 1,945.28-2,915.60-1,121.85

Finding the Fourth Proportional to 1,945.28, 2,915.60 and 1,121.85

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Solution

The fourth proportional to 1,945.28, 2,915.60 and 1,121.85 is: 1,681.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,945.28 : 2,915.60 = 1,121.85 : x
  2. Step 2: Convert to fraction form
    1,945.28/2,915.60 = 1,121.85/x
  3. Step 3: Cross multiply
    1,945.28x = 2,915.60 × 1,121.85
  4. Step 4: Simplify right side
    1,945.28x = 3,270,865.86
  5. Step 5: Solve for x
    x = 3,270,865.86/1,945.28
  6. Step 6: Final answer
    x = 1,681.44

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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.