Home / 28,120.80-38,815.92-19,739.36

Finding the Fourth Proportional to 28,120.80, 38,815.92 and 19,739.36

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Solution

The fourth proportional to 28,120.80, 38,815.92 and 19,739.36 is: 27,246.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,120.80 : 38,815.92 = 19,739.36 : x
  2. Step 2: Convert to fraction form
    28,120.80/38,815.92 = 19,739.36/x
  3. Step 3: Cross multiply
    28,120.80x = 38,815.92 × 19,739.36
  4. Step 4: Simplify right side
    28,120.80x = 766,201,418.61
  5. Step 5: Solve for x
    x = 766,201,418.61/28,120.80
  6. Step 6: Final answer
    x = 27,246.79

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.