Home / 20,635.86-28,478.07-12,138.60

Finding the Fourth Proportional to 20,635.86, 28,478.07 and 12,138.60

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Solution

The fourth proportional to 20,635.86, 28,478.07 and 12,138.60 is: 16,751.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,635.86 : 28,478.07 = 12,138.60 : x
  2. Step 2: Convert to fraction form
    20,635.86/28,478.07 = 12,138.60/x
  3. Step 3: Cross multiply
    20,635.86x = 28,478.07 × 12,138.60
  4. Step 4: Simplify right side
    20,635.86x = 345,683,900.50
  5. Step 5: Solve for x
    x = 345,683,900.50/20,635.86
  6. Step 6: Final answer
    x = 16,751.61

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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.