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Finding the Fourth Proportional to 20,884.76, 28,820.76 and 11,453.48

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Solution

The fourth proportional to 20,884.76, 28,820.76 and 11,453.48 is: 15,805.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,884.76 : 28,820.76 = 11,453.48 : x
  2. Step 2: Convert to fraction form
    20,884.76/28,820.76 = 11,453.48/x
  3. Step 3: Cross multiply
    20,884.76x = 28,820.76 × 11,453.48
  4. Step 4: Simplify right side
    20,884.76x = 330,097,998.24
  5. Step 5: Solve for x
    x = 330,097,998.24/20,884.76
  6. Step 6: Final answer
    x = 15,805.69

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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.