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Finding the Fourth Proportional to 72,662.35, 108,999.86 and 20,071.89

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Solution

The fourth proportional to 72,662.35, 108,999.86 and 20,071.89 is: 30,109.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,662.35 : 108,999.86 = 20,071.89 : x
  2. Step 2: Convert to fraction form
    72,662.35/108,999.86 = 20,071.89/x
  3. Step 3: Cross multiply
    72,662.35x = 108,999.86 × 20,071.89
  4. Step 4: Simplify right side
    72,662.35x = 2,187,833,199.94
  5. Step 5: Solve for x
    x = 2,187,833,199.94/72,662.35
  6. Step 6: Final answer
    x = 30,109.58

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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.