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Finding the Fourth Proportional to 20,489.80, 30,713.10 and 11,705.80

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Solution

The fourth proportional to 20,489.80, 30,713.10 and 11,705.80 is: 17,546.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,489.80 : 30,713.10 = 11,705.80 : x
  2. Step 2: Convert to fraction form
    20,489.80/30,713.10 = 11,705.80/x
  3. Step 3: Cross multiply
    20,489.80x = 30,713.10 × 11,705.80
  4. Step 4: Simplify right side
    20,489.80x = 359,521,405.98
  5. Step 5: Solve for x
    x = 359,521,405.98/20,489.80
  6. Step 6: Final answer
    x = 17,546.36

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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.