Home / 20,830.68-28,745.82-11,878.02

Finding the Fourth Proportional to 20,830.68, 28,745.82 and 11,878.02

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Solution

The fourth proportional to 20,830.68, 28,745.82 and 11,878.02 is: 16,391.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,830.68 : 28,745.82 = 11,878.02 : x
  2. Step 2: Convert to fraction form
    20,830.68/28,745.82 = 11,878.02/x
  3. Step 3: Cross multiply
    20,830.68x = 28,745.82 × 11,878.02
  4. Step 4: Simplify right side
    20,830.68x = 341,443,424.88
  5. Step 5: Solve for x
    x = 341,443,424.88/20,830.68
  6. Step 6: Final answer
    x = 16,391.37

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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.