Home / 1,267.16-1,890.80-1,121.36

Finding the Fourth Proportional to 1,267.16, 1,890.80 and 1,121.36

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Solution

The fourth proportional to 1,267.16, 1,890.80 and 1,121.36 is: 1,673.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,267.16 : 1,890.80 = 1,121.36 : x
  2. Step 2: Convert to fraction form
    1,267.16/1,890.80 = 1,121.36/x
  3. Step 3: Cross multiply
    1,267.16x = 1,890.80 × 1,121.36
  4. Step 4: Simplify right side
    1,267.16x = 2,120,267.49
  5. Step 5: Solve for x
    x = 2,120,267.49/1,267.16
  6. Step 6: Final answer
    x = 1,673.24

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.