Home / 20,910.78-28,846.14-13,739.76

Finding the Fourth Proportional to 20,910.78, 28,846.14 and 13,739.76

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Solution

The fourth proportional to 20,910.78, 28,846.14 and 13,739.76 is: 18,953.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,910.78 : 28,846.14 = 13,739.76 : x
  2. Step 2: Convert to fraction form
    20,910.78/28,846.14 = 13,739.76/x
  3. Step 3: Cross multiply
    20,910.78x = 28,846.14 × 13,739.76
  4. Step 4: Simplify right side
    20,910.78x = 396,339,040.53
  5. Step 5: Solve for x
    x = 396,339,040.53/20,910.78
  6. Step 6: Final answer
    x = 18,953.81

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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.