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Finding the Fourth Proportional to 21,906.40, 32,908.20 and 21,020.80

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Solution

The fourth proportional to 21,906.40, 32,908.20 and 21,020.80 is: 31,577.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,906.40 : 32,908.20 = 21,020.80 : x
  2. Step 2: Convert to fraction form
    21,906.40/32,908.20 = 21,020.80/x
  3. Step 3: Cross multiply
    21,906.40x = 32,908.20 × 21,020.80
  4. Step 4: Simplify right side
    21,906.40x = 691,756,690.56
  5. Step 5: Solve for x
    x = 691,756,690.56/21,906.40
  6. Step 6: Final answer
    x = 31,577.84

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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.