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Finding the Fourth Proportional to 20,489.59, 30,728.75 and 12,981.88

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Solution

The fourth proportional to 20,489.59, 30,728.75 and 12,981.88 is: 19,469.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,489.59 : 30,728.75 = 12,981.88 : x
  2. Step 2: Convert to fraction form
    20,489.59/30,728.75 = 12,981.88/x
  3. Step 3: Cross multiply
    20,489.59x = 30,728.75 × 12,981.88
  4. Step 4: Simplify right side
    20,489.59x = 398,916,900.68
  5. Step 5: Solve for x
    x = 398,916,900.68/20,489.59
  6. Step 6: Final answer
    x = 19,469.25

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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.