Home / 12,429.68-18,651.82-8,915.90

Finding the Fourth Proportional to 12,429.68, 18,651.82 and 8,915.90

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Solution

The fourth proportional to 12,429.68, 18,651.82 and 8,915.90 is: 13,379.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,429.68 : 18,651.82 = 8,915.90 : x
  2. Step 2: Convert to fraction form
    12,429.68/18,651.82 = 8,915.90/x
  3. Step 3: Cross multiply
    12,429.68x = 18,651.82 × 8,915.90
  4. Step 4: Simplify right side
    12,429.68x = 166,297,761.94
  5. Step 5: Solve for x
    x = 166,297,761.94/12,429.68
  6. Step 6: Final answer
    x = 13,379.09

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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.