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Finding the Fourth Proportional to 12,639.70, 18,922.83 and 7,358.60

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Solution

The fourth proportional to 12,639.70, 18,922.83 and 7,358.60 is: 11,016.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,639.70 : 18,922.83 = 7,358.60 : x
  2. Step 2: Convert to fraction form
    12,639.70/18,922.83 = 7,358.60/x
  3. Step 3: Cross multiply
    12,639.70x = 18,922.83 × 7,358.60
  4. Step 4: Simplify right side
    12,639.70x = 139,245,536.84
  5. Step 5: Solve for x
    x = 139,245,536.84/12,639.70
  6. Step 6: Final answer
    x = 11,016.52

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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.