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Finding the Fourth Proportional to 72,808.60, 109,212.90 and 20,218.60

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Solution

The fourth proportional to 72,808.60, 109,212.90 and 20,218.60 is: 30,327.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,808.60 : 109,212.90 = 20,218.60 : x
  2. Step 2: Convert to fraction form
    72,808.60/109,212.90 = 20,218.60/x
  3. Step 3: Cross multiply
    72,808.60x = 109,212.90 × 20,218.60
  4. Step 4: Simplify right side
    72,808.60x = 2,208,131,939.94
  5. Step 5: Solve for x
    x = 2,208,131,939.94/72,808.60
  6. Step 6: Final answer
    x = 30,327.90

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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.