Home / 3,918.80-5,878.16-1,321.72

Finding the Fourth Proportional to 3,918.80, 5,878.16 and 1,321.72

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Solution

The fourth proportional to 3,918.80, 5,878.16 and 1,321.72 is: 1,982.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,918.80 : 5,878.16 = 1,321.72 : x
  2. Step 2: Convert to fraction form
    3,918.80/5,878.16 = 1,321.72/x
  3. Step 3: Cross multiply
    3,918.80x = 5,878.16 × 1,321.72
  4. Step 4: Simplify right side
    3,918.80x = 7,769,281.64
  5. Step 5: Solve for x
    x = 7,769,281.64/3,918.80
  6. Step 6: Final answer
    x = 1,982.57

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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.