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Finding the Fourth Proportional to 216,236.53, 324,385.80 and 66,489.40

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Solution

The fourth proportional to 216,236.53, 324,385.80 and 66,489.40 is: 99,743.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    216,236.53 : 324,385.80 = 66,489.40 : x
  2. Step 2: Convert to fraction form
    216,236.53/324,385.80 = 66,489.40/x
  3. Step 3: Cross multiply
    216,236.53x = 324,385.80 × 66,489.40
  4. Step 4: Simplify right side
    216,236.53x = 21,568,217,210.52
  5. Step 5: Solve for x
    x = 21,568,217,210.52/216,236.53
  6. Step 6: Final answer
    x = 99,743.63

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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.