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Finding the Fourth Proportional to 21,759.70, 32,709.15 and 20,218.90

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Solution

The fourth proportional to 21,759.70, 32,709.15 and 20,218.90 is: 30,393.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,759.70 : 32,709.15 = 20,218.90 : x
  2. Step 2: Convert to fraction form
    21,759.70/32,709.15 = 20,218.90/x
  3. Step 3: Cross multiply
    21,759.70x = 32,709.15 × 20,218.90
  4. Step 4: Simplify right side
    21,759.70x = 661,343,032.94
  5. Step 5: Solve for x
    x = 661,343,032.94/21,759.70
  6. Step 6: Final answer
    x = 30,393.02

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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.