Home / 1,918.88-2,878.38-620.48

Finding the Fourth Proportional to 1,918.88, 2,878.38 and 620.48

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Solution

The fourth proportional to 1,918.88, 2,878.38 and 620.48 is: 930.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,918.88 : 2,878.38 = 620.48 : x
  2. Step 2: Convert to fraction form
    1,918.88/2,878.38 = 620.48/x
  3. Step 3: Cross multiply
    1,918.88x = 2,878.38 × 620.48
  4. Step 4: Simplify right side
    1,918.88x = 1,785,977.22
  5. Step 5: Solve for x
    x = 1,785,977.22/1,918.88
  6. Step 6: Final answer
    x = 930.74

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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.