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Finding the Fourth Proportional to 20,201.90, 30,300.53 and 7,721.64

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Solution

The fourth proportional to 20,201.90, 30,300.53 and 7,721.64 is: 11,581.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,201.90 : 30,300.53 = 7,721.64 : x
  2. Step 2: Convert to fraction form
    20,201.90/30,300.53 = 7,721.64/x
  3. Step 3: Cross multiply
    20,201.90x = 30,300.53 × 7,721.64
  4. Step 4: Simplify right side
    20,201.90x = 233,969,745.86
  5. Step 5: Solve for x
    x = 233,969,745.86/20,201.90
  6. Step 6: Final answer
    x = 11,581.57

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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.