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Finding the Fourth Proportional to 18,620.10, 27,930.15 and 12,715.20

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Solution

The fourth proportional to 18,620.10, 27,930.15 and 12,715.20 is: 19,072.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,620.10 : 27,930.15 = 12,715.20 : x
  2. Step 2: Convert to fraction form
    18,620.10/27,930.15 = 12,715.20/x
  3. Step 3: Cross multiply
    18,620.10x = 27,930.15 × 12,715.20
  4. Step 4: Simplify right side
    18,620.10x = 355,137,443.28
  5. Step 5: Solve for x
    x = 355,137,443.28/18,620.10
  6. Step 6: Final answer
    x = 19,072.80

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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.