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Finding the Fourth Proportional to 18,170.80, 25,060.70 and 12,811.10

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Solution

The fourth proportional to 18,170.80, 25,060.70 and 12,811.10 is: 17,668.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,170.80 : 25,060.70 = 12,811.10 : x
  2. Step 2: Convert to fraction form
    18,170.80/25,060.70 = 12,811.10/x
  3. Step 3: Cross multiply
    18,170.80x = 25,060.70 × 12,811.10
  4. Step 4: Simplify right side
    18,170.80x = 321,055,055.10
  5. Step 5: Solve for x
    x = 321,055,055.10/18,170.80
  6. Step 6: Final answer
    x = 17,668.74

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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.