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Finding the Fourth Proportional to 216,429.52, 324,679.20 and 66,669.80

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Solution

The fourth proportional to 216,429.52, 324,679.20 and 66,669.80 is: 100,015.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    216,429.52 : 324,679.20 = 66,669.80 : x
  2. Step 2: Convert to fraction form
    216,429.52/324,679.20 = 66,669.80/x
  3. Step 3: Cross multiply
    216,429.52x = 324,679.20 × 66,669.80
  4. Step 4: Simplify right side
    216,429.52x = 21,646,297,328.16
  5. Step 5: Solve for x
    x = 21,646,297,328.16/216,429.52
  6. Step 6: Final answer
    x = 100,015.46

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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.