Home / 2,291.70-3,436.40-1,121.80

Finding the Fourth Proportional to 2,291.70, 3,436.40 and 1,121.80

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Solution

The fourth proportional to 2,291.70, 3,436.40 and 1,121.80 is: 1,682.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,291.70 : 3,436.40 = 1,121.80 : x
  2. Step 2: Convert to fraction form
    2,291.70/3,436.40 = 1,121.80/x
  3. Step 3: Cross multiply
    2,291.70x = 3,436.40 × 1,121.80
  4. Step 4: Simplify right side
    2,291.70x = 3,854,953.52
  5. Step 5: Solve for x
    x = 3,854,953.52/2,291.70
  6. Step 6: Final answer
    x = 1,682.14

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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.