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Finding the Fourth Proportional to 20,877.70, 28,811.46 and 11,926.40

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Solution

The fourth proportional to 20,877.70, 28,811.46 and 11,926.40 is: 16,458.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,877.70 : 28,811.46 = 11,926.40 : x
  2. Step 2: Convert to fraction form
    20,877.70/28,811.46 = 11,926.40/x
  3. Step 3: Cross multiply
    20,877.70x = 28,811.46 × 11,926.40
  4. Step 4: Simplify right side
    20,877.70x = 343,616,996.54
  5. Step 5: Solve for x
    x = 343,616,996.54/20,877.70
  6. Step 6: Final answer
    x = 16,458.57

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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.