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Finding the Fourth Proportional to 216,072.79, 324,143.75 and 91,414.87

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Solution

The fourth proportional to 216,072.79, 324,143.75 and 91,414.87 is: 137,136.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    216,072.79 : 324,143.75 = 91,414.87 : x
  2. Step 2: Convert to fraction form
    216,072.79/324,143.75 = 91,414.87/x
  3. Step 3: Cross multiply
    216,072.79x = 324,143.75 × 91,414.87
  4. Step 4: Simplify right side
    216,072.79x = 29,631,558,767.56
  5. Step 5: Solve for x
    x = 29,631,558,767.56/216,072.79
  6. Step 6: Final answer
    x = 137,136.93

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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.