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Finding the Fourth Proportional to 18,745.92, 28,108.23 and 7,639.60

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Solution

The fourth proportional to 18,745.92, 28,108.23 and 7,639.60 is: 11,455.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,745.92 : 28,108.23 = 7,639.60 : x
  2. Step 2: Convert to fraction form
    18,745.92/28,108.23 = 7,639.60/x
  3. Step 3: Cross multiply
    18,745.92x = 28,108.23 × 7,639.60
  4. Step 4: Simplify right side
    18,745.92x = 214,735,633.91
  5. Step 5: Solve for x
    x = 214,735,633.91/18,745.92
  6. Step 6: Final answer
    x = 11,455.06

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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.