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Finding the Fourth Proportional to 20,649.87, 28,496.88 and 11,218.41

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Solution

The fourth proportional to 20,649.87, 28,496.88 and 11,218.41 is: 15,481.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,649.87 : 28,496.88 = 11,218.41 : x
  2. Step 2: Convert to fraction form
    20,649.87/28,496.88 = 11,218.41/x
  3. Step 3: Cross multiply
    20,649.87x = 28,496.88 × 11,218.41
  4. Step 4: Simplify right side
    20,649.87x = 319,689,683.56
  5. Step 5: Solve for x
    x = 319,689,683.56/20,649.87
  6. Step 6: Final answer
    x = 15,481.44

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.