Home / 20,380.50-28,124.73-11,427.98

Finding the Fourth Proportional to 20,380.50, 28,124.73 and 11,427.98

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Solution

The fourth proportional to 20,380.50, 28,124.73 and 11,427.98 is: 15,770.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,380.50 : 28,124.73 = 11,427.98 : x
  2. Step 2: Convert to fraction form
    20,380.50/28,124.73 = 11,427.98/x
  3. Step 3: Cross multiply
    20,380.50x = 28,124.73 × 11,427.98
  4. Step 4: Simplify right side
    20,380.50x = 321,408,711.32
  5. Step 5: Solve for x
    x = 321,408,711.32/20,380.50
  6. Step 6: Final answer
    x = 15,770.40

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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.