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Finding the Fourth Proportional to 136,878.33, 188,890.09 and 76,449.81

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Solution

The fourth proportional to 136,878.33, 188,890.09 and 76,449.81 is: 105,499.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    136,878.33 : 188,890.09 = 76,449.81 : x
  2. Step 2: Convert to fraction form
    136,878.33/188,890.09 = 76,449.81/x
  3. Step 3: Cross multiply
    136,878.33x = 188,890.09 × 76,449.81
  4. Step 4: Simplify right side
    136,878.33x = 14,440,611,850.48
  5. Step 5: Solve for x
    x = 14,440,611,850.48/136,878.33
  6. Step 6: Final answer
    x = 105,499.62

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Why These Related Problems?

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