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Finding the Fourth Proportional to 20,796.78, 28,736.22 and 15,411.48

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Solution

The fourth proportional to 20,796.78, 28,736.22 and 15,411.48 is: 21,295.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,796.78 : 28,736.22 = 15,411.48 : x
  2. Step 2: Convert to fraction form
    20,796.78/28,736.22 = 15,411.48/x
  3. Step 3: Cross multiply
    20,796.78x = 28,736.22 × 15,411.48
  4. Step 4: Simplify right side
    20,796.78x = 442,867,679.81
  5. Step 5: Solve for x
    x = 442,867,679.81/20,796.78
  6. Step 6: Final answer
    x = 21,295.01

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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.