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Finding the Fourth Proportional to 72,860.25, 109,290.60 and 20,269.80

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Solution

The fourth proportional to 72,860.25, 109,290.60 and 20,269.80 is: 30,404.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,860.25 : 109,290.60 = 20,269.80 : x
  2. Step 2: Convert to fraction form
    72,860.25/109,290.60 = 20,269.80/x
  3. Step 3: Cross multiply
    72,860.25x = 109,290.60 × 20,269.80
  4. Step 4: Simplify right side
    72,860.25x = 2,215,298,603.88
  5. Step 5: Solve for x
    x = 2,215,298,603.88/72,860.25
  6. Step 6: Final answer
    x = 30,404.76

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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.