Home / 28,420.14-39,219.78-15,844.86

Finding the Fourth Proportional to 28,420.14, 39,219.78 and 15,844.86

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Solution

The fourth proportional to 28,420.14, 39,219.78 and 15,844.86 is: 21,865.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,420.14 : 39,219.78 = 15,844.86 : x
  2. Step 2: Convert to fraction form
    28,420.14/39,219.78 = 15,844.86/x
  3. Step 3: Cross multiply
    28,420.14x = 39,219.78 × 15,844.86
  4. Step 4: Simplify right side
    28,420.14x = 621,431,923.33
  5. Step 5: Solve for x
    x = 621,431,923.33/28,420.14
  6. Step 6: Final answer
    x = 21,865.90

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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.