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Finding the Fourth Proportional to 21,649.81, 29,879.19 and 12,217.63

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Solution

The fourth proportional to 21,649.81, 29,879.19 and 12,217.63 is: 16,861.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,649.81 : 29,879.19 = 12,217.63 : x
  2. Step 2: Convert to fraction form
    21,649.81/29,879.19 = 12,217.63/x
  3. Step 3: Cross multiply
    21,649.81x = 29,879.19 × 12,217.63
  4. Step 4: Simplify right side
    21,649.81x = 365,052,888.12
  5. Step 5: Solve for x
    x = 365,052,888.12/21,649.81
  6. Step 6: Final answer
    x = 16,861.71

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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.