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Finding the Fourth Proportional to 21,759.20, 32,708.40 and 20,218.40

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Solution

The fourth proportional to 21,759.20, 32,708.40 and 20,218.40 is: 30,392.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,759.20 : 32,708.40 = 20,218.40 : x
  2. Step 2: Convert to fraction form
    21,759.20/32,708.40 = 20,218.40/x
  3. Step 3: Cross multiply
    21,759.20x = 32,708.40 × 20,218.40
  4. Step 4: Simplify right side
    21,759.20x = 661,311,514.56
  5. Step 5: Solve for x
    x = 661,311,514.56/21,759.20
  6. Step 6: Final answer
    x = 30,392.27

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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.