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Finding the Fourth Proportional to 12,438.75, 17,180.06 and 8,239.71

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Solution

The fourth proportional to 12,438.75, 17,180.06 and 8,239.71 is: 11,380.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,438.75 : 17,180.06 = 8,239.71 : x
  2. Step 2: Convert to fraction form
    12,438.75/17,180.06 = 8,239.71/x
  3. Step 3: Cross multiply
    12,438.75x = 17,180.06 × 8,239.71
  4. Step 4: Simplify right side
    12,438.75x = 141,558,670.98
  5. Step 5: Solve for x
    x = 141,558,670.98/12,438.75
  6. Step 6: Final answer
    x = 11,380.46

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.