Home / 1,392.49-2,089.74-1,121.85

Finding the Fourth Proportional to 1,392.49, 2,089.74 and 1,121.85

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Solution

The fourth proportional to 1,392.49, 2,089.74 and 1,121.85 is: 1,683.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,392.49 : 2,089.74 = 1,121.85 : x
  2. Step 2: Convert to fraction form
    1,392.49/2,089.74 = 1,121.85/x
  3. Step 3: Cross multiply
    1,392.49x = 2,089.74 × 1,121.85
  4. Step 4: Simplify right side
    1,392.49x = 2,344,364.37
  5. Step 5: Solve for x
    x = 2,344,364.37/1,392.49
  6. Step 6: Final answer
    x = 1,683.58

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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.