Home / 1,920.14-2,879.60-621.31

Finding the Fourth Proportional to 1,920.14, 2,879.60 and 621.31

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Solution

The fourth proportional to 1,920.14, 2,879.60 and 621.31 is: 931.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,920.14 : 2,879.60 = 621.31 : x
  2. Step 2: Convert to fraction form
    1,920.14/2,879.60 = 621.31/x
  3. Step 3: Cross multiply
    1,920.14x = 2,879.60 × 621.31
  4. Step 4: Simplify right side
    1,920.14x = 1,789,113.97
  5. Step 5: Solve for x
    x = 1,789,113.97/1,920.14
  6. Step 6: Final answer
    x = 931.76

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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.