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Finding the Fourth Proportional to 20,628, 28,449.36 and 17,776.80

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Solution

The fourth proportional to 20,628, 28,449.36 and 17,776.80 is: 24,517.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,628 : 28,449.36 = 17,776.80 : x
  2. Step 2: Convert to fraction form
    20,628/28,449.36 = 17,776.80/x
  3. Step 3: Cross multiply
    20,628x = 28,449.36 × 17,776.80
  4. Step 4: Simplify right side
    20,628x = 505,738,582.85
  5. Step 5: Solve for x
    x = 505,738,582.85/20,628
  6. Step 6: Final answer
    x = 24,517.09

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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.