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Finding the Fourth Proportional to 18,687.60, 28,074.06 and 12,126.60

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Solution

The fourth proportional to 18,687.60, 28,074.06 and 12,126.60 is: 18,217.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,687.60 : 28,074.06 = 12,126.60 : x
  2. Step 2: Convert to fraction form
    18,687.60/28,074.06 = 12,126.60/x
  3. Step 3: Cross multiply
    18,687.60x = 28,074.06 × 12,126.60
  4. Step 4: Simplify right side
    18,687.60x = 340,442,896.00
  5. Step 5: Solve for x
    x = 340,442,896.00/18,687.60
  6. Step 6: Final answer
    x = 18,217.58

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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.