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Finding the Fourth Proportional to 21,660.96, 29,891.52 and 12,230.40

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Solution

The fourth proportional to 21,660.96, 29,891.52 and 12,230.40 is: 16,877.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,660.96 : 29,891.52 = 12,230.40 : x
  2. Step 2: Convert to fraction form
    21,660.96/29,891.52 = 12,230.40/x
  3. Step 3: Cross multiply
    21,660.96x = 29,891.52 × 12,230.40
  4. Step 4: Simplify right side
    21,660.96x = 365,585,246.21
  5. Step 5: Solve for x
    x = 365,585,246.21/21,660.96
  6. Step 6: Final answer
    x = 16,877.61

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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.