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Finding the Fourth Proportional to 20,999.20, 30,234.96 and 20,999.20

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Solution

The fourth proportional to 20,999.20, 30,234.96 and 20,999.20 is: 30,234.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,999.20 : 30,234.96 = 20,999.20 : x
  2. Step 2: Convert to fraction form
    20,999.20/30,234.96 = 20,999.20/x
  3. Step 3: Cross multiply
    20,999.20x = 30,234.96 × 20,999.20
  4. Step 4: Simplify right side
    20,999.20x = 634,909,972.03
  5. Step 5: Solve for x
    x = 634,909,972.03/20,999.20
  6. Step 6: Final answer
    x = 30,234.96

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.44) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.