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Finding the Fourth Proportional to 12,489.76, 18,745.98 and 6,651.28

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Solution

The fourth proportional to 12,489.76, 18,745.98 and 6,651.28 is: 9,982.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,489.76 : 18,745.98 = 6,651.28 : x
  2. Step 2: Convert to fraction form
    12,489.76/18,745.98 = 6,651.28/x
  3. Step 3: Cross multiply
    12,489.76x = 18,745.98 × 6,651.28
  4. Step 4: Simplify right side
    12,489.76x = 124,684,761.85
  5. Step 5: Solve for x
    x = 124,684,761.85/12,489.76
  6. Step 6: Final answer
    x = 9,982.96

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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.