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Finding the Fourth Proportional to 18,680.20, 28,020.30 and 13,139.80

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Solution

The fourth proportional to 18,680.20, 28,020.30 and 13,139.80 is: 19,709.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,680.20 : 28,020.30 = 13,139.80 : x
  2. Step 2: Convert to fraction form
    18,680.20/28,020.30 = 13,139.80/x
  3. Step 3: Cross multiply
    18,680.20x = 28,020.30 × 13,139.80
  4. Step 4: Simplify right side
    18,680.20x = 368,181,137.94
  5. Step 5: Solve for x
    x = 368,181,137.94/18,680.20
  6. Step 6: Final answer
    x = 19,709.70

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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.