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Finding the Fourth Proportional to 17,107.20, 25,660.80 and 12,405.15

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Solution

The fourth proportional to 17,107.20, 25,660.80 and 12,405.15 is: 18,607.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    17,107.20 : 25,660.80 = 12,405.15 : x
  2. Step 2: Convert to fraction form
    17,107.20/25,660.80 = 12,405.15/x
  3. Step 3: Cross multiply
    17,107.20x = 25,660.80 × 12,405.15
  4. Step 4: Simplify right side
    17,107.20x = 318,326,073.12
  5. Step 5: Solve for x
    x = 318,326,073.12/17,107.20
  6. Step 6: Final answer
    x = 18,607.73

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.