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Finding the Fourth Proportional to 18,613.80, 27,930.15 and 12,378.15

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Solution

The fourth proportional to 18,613.80, 27,930.15 and 12,378.15 is: 18,573.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,613.80 : 27,930.15 = 12,378.15 : x
  2. Step 2: Convert to fraction form
    18,613.80/27,930.15 = 12,378.15/x
  3. Step 3: Cross multiply
    18,613.80x = 27,930.15 × 12,378.15
  4. Step 4: Simplify right side
    18,613.80x = 345,723,586.22
  5. Step 5: Solve for x
    x = 345,723,586.22/18,613.80
  6. Step 6: Final answer
    x = 18,573.51

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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.