Home / 28,364.45-39,143.25-15,789.20

Finding the Fourth Proportional to 28,364.45, 39,143.25 and 15,789.20

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Solution

The fourth proportional to 28,364.45, 39,143.25 and 15,789.20 is: 21,789.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,364.45 : 39,143.25 = 15,789.20 : x
  2. Step 2: Convert to fraction form
    28,364.45/39,143.25 = 15,789.20/x
  3. Step 3: Cross multiply
    28,364.45x = 39,143.25 × 15,789.20
  4. Step 4: Simplify right side
    28,364.45x = 618,040,407.18
  5. Step 5: Solve for x
    x = 618,040,407.18/28,364.45
  6. Step 6: Final answer
    x = 21,789.26

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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.