Home / 28,364.96-39,145.20-15,789.44

Finding the Fourth Proportional to 28,364.96, 39,145.20 and 15,789.44

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Solution

The fourth proportional to 28,364.96, 39,145.20 and 15,789.44 is: 21,790.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,364.96 : 39,145.20 = 15,789.44 : x
  2. Step 2: Convert to fraction form
    28,364.96/39,145.20 = 15,789.44/x
  3. Step 3: Cross multiply
    28,364.96x = 39,145.20 × 15,789.44
  4. Step 4: Simplify right side
    28,364.96x = 618,080,786.69
  5. Step 5: Solve for x
    x = 618,080,786.69/28,364.96
  6. Step 6: Final answer
    x = 21,790.29

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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.