Home / 1,918.57-2,878.40-620.41

Finding the Fourth Proportional to 1,918.57, 2,878.40 and 620.41

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Solution

The fourth proportional to 1,918.57, 2,878.40 and 620.41 is: 930.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,918.57 : 2,878.40 = 620.41 : x
  2. Step 2: Convert to fraction form
    1,918.57/2,878.40 = 620.41/x
  3. Step 3: Cross multiply
    1,918.57x = 2,878.40 × 620.41
  4. Step 4: Simplify right side
    1,918.57x = 1,785,788.14
  5. Step 5: Solve for x
    x = 1,785,788.14/1,918.57
  6. Step 6: Final answer
    x = 930.79

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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.