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Finding the Fourth Proportional to 20,620.89, 28,480.02 and 13,894.74

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Solution

The fourth proportional to 20,620.89, 28,480.02 and 13,894.74 is: 19,190.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,620.89 : 28,480.02 = 13,894.74 : x
  2. Step 2: Convert to fraction form
    20,620.89/28,480.02 = 13,894.74/x
  3. Step 3: Cross multiply
    20,620.89x = 28,480.02 × 13,894.74
  4. Step 4: Simplify right side
    20,620.89x = 395,722,473.09
  5. Step 5: Solve for x
    x = 395,722,473.09/20,620.89
  6. Step 6: Final answer
    x = 19,190.37

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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.