Home / 20,680.49-28,540.55-11,728.77

Finding the Fourth Proportional to 20,680.49, 28,540.55 and 11,728.77

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Solution

The fourth proportional to 20,680.49, 28,540.55 and 11,728.77 is: 16,186.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,680.49 : 28,540.55 = 11,728.77 : x
  2. Step 2: Convert to fraction form
    20,680.49/28,540.55 = 11,728.77/x
  3. Step 3: Cross multiply
    20,680.49x = 28,540.55 × 11,728.77
  4. Step 4: Simplify right side
    20,680.49x = 334,745,487.98
  5. Step 5: Solve for x
    x = 334,745,487.98/20,680.49
  6. Step 6: Final answer
    x = 16,186.54

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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.