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Finding the Fourth Proportional to 20,879.82, 28,797.39 and 18,356.58

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Solution

The fourth proportional to 20,879.82, 28,797.39 and 18,356.58 is: 25,317.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,879.82 : 28,797.39 = 18,356.58 : x
  2. Step 2: Convert to fraction form
    20,879.82/28,797.39 = 18,356.58/x
  3. Step 3: Cross multiply
    20,879.82x = 28,797.39 × 18,356.58
  4. Step 4: Simplify right side
    20,879.82x = 528,621,593.33
  5. Step 5: Solve for x
    x = 528,621,593.33/20,879.82
  6. Step 6: Final answer
    x = 25,317.34

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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.