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Finding the Fourth Proportional to 72,999.72, 109,503.81 and 20,409.03

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Solution

The fourth proportional to 72,999.72, 109,503.81 and 20,409.03 is: 30,614.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,999.72 : 109,503.81 = 20,409.03 : x
  2. Step 2: Convert to fraction form
    72,999.72/109,503.81 = 20,409.03/x
  3. Step 3: Cross multiply
    72,999.72x = 109,503.81 × 20,409.03
  4. Step 4: Simplify right side
    72,999.72x = 2,234,866,543.40
  5. Step 5: Solve for x
    x = 2,234,866,543.40/72,999.72
  6. Step 6: Final answer
    x = 30,614.73

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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.