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Finding the Fourth Proportional to 20,649.80, 30,984.62 and 11,289.44

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Solution

The fourth proportional to 20,649.80, 30,984.62 and 11,289.44 is: 16,939.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,649.80 : 30,984.62 = 11,289.44 : x
  2. Step 2: Convert to fraction form
    20,649.80/30,984.62 = 11,289.44/x
  3. Step 3: Cross multiply
    20,649.80x = 30,984.62 × 11,289.44
  4. Step 4: Simplify right side
    20,649.80x = 349,799,114.10
  5. Step 5: Solve for x
    x = 349,799,114.10/20,649.80
  6. Step 6: Final answer
    x = 16,939.59

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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.