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Finding the Fourth Proportional to 17,105.80, 25,658.70 and 12,440.20

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Solution

The fourth proportional to 17,105.80, 25,658.70 and 12,440.20 is: 18,660.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    17,105.80 : 25,658.70 = 12,440.20 : x
  2. Step 2: Convert to fraction form
    17,105.80/25,658.70 = 12,440.20/x
  3. Step 3: Cross multiply
    17,105.80x = 25,658.70 × 12,440.20
  4. Step 4: Simplify right side
    17,105.80x = 319,199,359.74
  5. Step 5: Solve for x
    x = 319,199,359.74/17,105.80
  6. Step 6: Final answer
    x = 18,660.30

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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.