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Finding the Fourth Proportional to 72,710.25, 109,067.80 and 20,115.33

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Solution

The fourth proportional to 72,710.25, 109,067.80 and 20,115.33 is: 30,173.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,710.25 : 109,067.80 = 20,115.33 : x
  2. Step 2: Convert to fraction form
    72,710.25/109,067.80 = 20,115.33/x
  3. Step 3: Cross multiply
    72,710.25x = 109,067.80 × 20,115.33
  4. Step 4: Simplify right side
    72,710.25x = 2,193,934,789.37
  5. Step 5: Solve for x
    x = 2,193,934,789.37/72,710.25
  6. Step 6: Final answer
    x = 30,173.67

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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.