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Finding the Fourth Proportional to 216,418.21, 324,662.20 and 66,658.43

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Solution

The fourth proportional to 216,418.21, 324,662.20 and 66,658.43 is: 99,998.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    216,418.21 : 324,662.20 = 66,658.43 : x
  2. Step 2: Convert to fraction form
    216,418.21/324,662.20 = 66,658.43/x
  3. Step 3: Cross multiply
    216,418.21x = 324,662.20 × 66,658.43
  4. Step 4: Simplify right side
    216,418.21x = 21,641,473,552.31
  5. Step 5: Solve for x
    x = 21,641,473,552.31/216,418.21
  6. Step 6: Final answer
    x = 99,998.39

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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.