Home / 1,121.12-1,679.84-1,078.48

Finding the Fourth Proportional to 1,121.12, 1,679.84 and 1,078.48

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Solution

The fourth proportional to 1,121.12, 1,679.84 and 1,078.48 is: 1,615.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,121.12 : 1,679.84 = 1,078.48 : x
  2. Step 2: Convert to fraction form
    1,121.12/1,679.84 = 1,078.48/x
  3. Step 3: Cross multiply
    1,121.12x = 1,679.84 × 1,078.48
  4. Step 4: Simplify right side
    1,121.12x = 1,811,673.84
  5. Step 5: Solve for x
    x = 1,811,673.84/1,121.12
  6. Step 6: Final answer
    x = 1,615.95

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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.