Home / 28,339.78-39,120.42-18,268.78

Finding the Fourth Proportional to 28,339.78, 39,120.42 and 18,268.78

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Solution

The fourth proportional to 28,339.78, 39,120.42 and 18,268.78 is: 25,218.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,339.78 : 39,120.42 = 18,268.78 : x
  2. Step 2: Convert to fraction form
    28,339.78/39,120.42 = 18,268.78/x
  3. Step 3: Cross multiply
    28,339.78x = 39,120.42 × 18,268.78
  4. Step 4: Simplify right side
    28,339.78x = 714,682,346.49
  5. Step 5: Solve for x
    x = 714,682,346.49/28,339.78
  6. Step 6: Final answer
    x = 25,218.34

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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.