Home / 1,772.39-2,655.80-1,121.75

Finding the Fourth Proportional to 1,772.39, 2,655.80 and 1,121.75

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Solution

The fourth proportional to 1,772.39, 2,655.80 and 1,121.75 is: 1,680.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,772.39 : 2,655.80 = 1,121.75 : x
  2. Step 2: Convert to fraction form
    1,772.39/2,655.80 = 1,121.75/x
  3. Step 3: Cross multiply
    1,772.39x = 2,655.80 × 1,121.75
  4. Step 4: Simplify right side
    1,772.39x = 2,979,143.65
  5. Step 5: Solve for x
    x = 2,979,143.65/1,772.39
  6. Step 6: Final answer
    x = 1,680.86

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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.