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Finding the Fourth Proportional to 20,879.79, 28,797.37 and 18,356.55

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Solution

The fourth proportional to 20,879.79, 28,797.37 and 18,356.55 is: 25,317.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,879.79 : 28,797.37 = 18,356.55 : x
  2. Step 2: Convert to fraction form
    20,879.79/28,797.37 = 18,356.55/x
  3. Step 3: Cross multiply
    20,879.79x = 28,797.37 × 18,356.55
  4. Step 4: Simplify right side
    20,879.79x = 528,620,362.27
  5. Step 5: Solve for x
    x = 528,620,362.27/20,879.79
  6. Step 6: Final answer
    x = 25,317.32

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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.