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Finding the Fourth Proportional to 20,479, 30,723.36 and 6,628

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Solution

The fourth proportional to 20,479, 30,723.36 and 6,628 is: 9,943.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,479 : 30,723.36 = 6,628 : x
  2. Step 2: Convert to fraction form
    20,479/30,723.36 = 6,628/x
  3. Step 3: Cross multiply
    20,479x = 30,723.36 × 6,628
  4. Step 4: Simplify right side
    20,479x = 203,634,430.08
  5. Step 5: Solve for x
    x = 203,634,430.08/20,479
  6. Step 6: Final answer
    x = 9,943.57

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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.