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Finding the Fourth Proportional to 18,622.91, 25,674.46 and 12,644.20

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Solution

The fourth proportional to 18,622.91, 25,674.46 and 12,644.20 is: 17,431.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,622.91 : 25,674.46 = 12,644.20 : x
  2. Step 2: Convert to fraction form
    18,622.91/25,674.46 = 12,644.20/x
  3. Step 3: Cross multiply
    18,622.91x = 25,674.46 × 12,644.20
  4. Step 4: Simplify right side
    18,622.91x = 324,633,078.74
  5. Step 5: Solve for x
    x = 324,633,078.74/18,622.91
  6. Step 6: Final answer
    x = 17,431.92

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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.