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Finding the Fourth Proportional to 20,795.69, 28,689.90 and 12,824.09

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Solution

The fourth proportional to 20,795.69, 28,689.90 and 12,824.09 is: 17,692.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,795.69 : 28,689.90 = 12,824.09 : x
  2. Step 2: Convert to fraction form
    20,795.69/28,689.90 = 12,824.09/x
  3. Step 3: Cross multiply
    20,795.69x = 28,689.90 × 12,824.09
  4. Step 4: Simplify right side
    20,795.69x = 367,921,859.69
  5. Step 5: Solve for x
    x = 367,921,859.69/20,795.69
  6. Step 6: Final answer
    x = 17,692.22

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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.