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Finding the Fourth Proportional to 20,809, 28,716.94 and 12,632.70

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Solution

The fourth proportional to 20,809, 28,716.94 and 12,632.70 is: 17,433.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,809 : 28,716.94 = 12,632.70 : x
  2. Step 2: Convert to fraction form
    20,809/28,716.94 = 12,632.70/x
  3. Step 3: Cross multiply
    20,809x = 28,716.94 × 12,632.70
  4. Step 4: Simplify right side
    20,809x = 362,772,487.94
  5. Step 5: Solve for x
    x = 362,772,487.94/20,809
  6. Step 6: Final answer
    x = 17,433.44

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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.