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Finding the Fourth Proportional to 18,713.80, 28,069.08 and 7,621.66

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Solution

The fourth proportional to 18,713.80, 28,069.08 and 7,621.66 is: 11,431.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,713.80 : 28,069.08 = 7,621.66 : x
  2. Step 2: Convert to fraction form
    18,713.80/28,069.08 = 7,621.66/x
  3. Step 3: Cross multiply
    18,713.80x = 28,069.08 × 7,621.66
  4. Step 4: Simplify right side
    18,713.80x = 213,932,984.27
  5. Step 5: Solve for x
    x = 213,932,984.27/18,713.80
  6. Step 6: Final answer
    x = 11,431.83

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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.