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Finding the Fourth Proportional to 20,321.73, 30,472.88 and 8,628.57

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Solution

The fourth proportional to 20,321.73, 30,472.88 and 8,628.57 is: 12,938.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,321.73 : 30,472.88 = 8,628.57 : x
  2. Step 2: Convert to fraction form
    20,321.73/30,472.88 = 8,628.57/x
  3. Step 3: Cross multiply
    20,321.73x = 30,472.88 × 8,628.57
  4. Step 4: Simplify right side
    20,321.73x = 262,937,335.04
  5. Step 5: Solve for x
    x = 262,937,335.04/20,321.73
  6. Step 6: Final answer
    x = 12,938.73

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1.5x scale

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.