Home / 20,379.88-28,124.85-11,428.21

Finding the Fourth Proportional to 20,379.88, 28,124.85 and 11,428.21

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Solution

The fourth proportional to 20,379.88, 28,124.85 and 11,428.21 is: 15,771.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,379.88 : 28,124.85 = 11,428.21 : x
  2. Step 2: Convert to fraction form
    20,379.88/28,124.85 = 11,428.21/x
  3. Step 3: Cross multiply
    20,379.88x = 28,124.85 × 11,428.21
  4. Step 4: Simplify right side
    20,379.88x = 321,416,692.02
  5. Step 5: Solve for x
    x = 321,416,692.02/20,379.88
  6. Step 6: Final answer
    x = 15,771.28

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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.