Home / 1,290.21-1,935.42-412.83

Finding the Fourth Proportional to 1,290.21, 1,935.42 and 412.83

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Solution

The fourth proportional to 1,290.21, 1,935.42 and 412.83 is: 619.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,290.21 : 1,935.42 = 412.83 : x
  2. Step 2: Convert to fraction form
    1,290.21/1,935.42 = 412.83/x
  3. Step 3: Cross multiply
    1,290.21x = 1,935.42 × 412.83
  4. Step 4: Simplify right side
    1,290.21x = 798,999.44
  5. Step 5: Solve for x
    x = 798,999.44/1,290.21
  6. Step 6: Final answer
    x = 619.28

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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.