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Finding the Fourth Proportional to 20,621, 28,461.22 and 11,669

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Solution

The fourth proportional to 20,621, 28,461.22 and 11,669 is: 16,105.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,621 : 28,461.22 = 11,669 : x
  2. Step 2: Convert to fraction form
    20,621/28,461.22 = 11,669/x
  3. Step 3: Cross multiply
    20,621x = 28,461.22 × 11,669
  4. Step 4: Simplify right side
    20,621x = 332,113,976.18
  5. Step 5: Solve for x
    x = 332,113,976.18/20,621
  6. Step 6: Final answer
    x = 16,105.62

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.