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Finding the Fourth Proportional to 18,651.83, 27,980.89 and 13,285.55

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Solution

The fourth proportional to 18,651.83, 27,980.89 and 13,285.55 is: 19,930.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,651.83 : 27,980.89 = 13,285.55 : x
  2. Step 2: Convert to fraction form
    18,651.83/27,980.89 = 13,285.55/x
  3. Step 3: Cross multiply
    18,651.83x = 27,980.89 × 13,285.55
  4. Step 4: Simplify right side
    18,651.83x = 371,741,549.88
  5. Step 5: Solve for x
    x = 371,741,549.88/18,651.83
  6. Step 6: Final answer
    x = 19,930.57

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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.