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Finding the Fourth Proportional to 72,879.49, 109,319.37 and 20,288.98

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Solution

The fourth proportional to 72,879.49, 109,319.37 and 20,288.98 is: 30,433.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,879.49 : 109,319.37 = 20,288.98 : x
  2. Step 2: Convert to fraction form
    72,879.49/109,319.37 = 20,288.98/x
  3. Step 3: Cross multiply
    72,879.49x = 109,319.37 × 20,288.98
  4. Step 4: Simplify right side
    72,879.49x = 2,217,978,511.54
  5. Step 5: Solve for x
    x = 2,217,978,511.54/72,879.49
  6. Step 6: Final answer
    x = 30,433.51

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.