Home / 20,636.86-28,478.46-12,139.90

Finding the Fourth Proportional to 20,636.86, 28,478.46 and 12,139.90

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Solution

The fourth proportional to 20,636.86, 28,478.46 and 12,139.90 is: 16,752.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,636.86 : 28,478.46 = 12,139.90 : x
  2. Step 2: Convert to fraction form
    20,636.86/28,478.46 = 12,139.90/x
  3. Step 3: Cross multiply
    20,636.86x = 28,478.46 × 12,139.90
  4. Step 4: Simplify right side
    20,636.86x = 345,725,656.55
  5. Step 5: Solve for x
    x = 345,725,656.55/20,636.86
  6. Step 6: Final answer
    x = 16,752.82

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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.