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Finding the Fourth Proportional to 20,878, 28,814.08 and 11,926.80

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Solution

The fourth proportional to 20,878, 28,814.08 and 11,926.80 is: 16,460.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,878 : 28,814.08 = 11,926.80 : x
  2. Step 2: Convert to fraction form
    20,878/28,814.08 = 11,926.80/x
  3. Step 3: Cross multiply
    20,878x = 28,814.08 × 11,926.80
  4. Step 4: Simplify right side
    20,878x = 343,659,769.34
  5. Step 5: Solve for x
    x = 343,659,769.34/20,878
  6. Step 6: Final answer
    x = 16,460.38

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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.