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Finding the Fourth Proportional to 21,650.80, 29,879.76 and 12,219.52

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Solution

The fourth proportional to 21,650.80, 29,879.76 and 12,219.52 is: 16,863.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,650.80 : 29,879.76 = 12,219.52 : x
  2. Step 2: Convert to fraction form
    21,650.80/29,879.76 = 12,219.52/x
  3. Step 3: Cross multiply
    21,650.80x = 29,879.76 × 12,219.52
  4. Step 4: Simplify right side
    21,650.80x = 365,116,324.92
  5. Step 5: Solve for x
    x = 365,116,324.92/21,650.80
  6. Step 6: Final answer
    x = 16,863.87

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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.