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Finding the Fourth Proportional to 219,912.57, 303,409.80 and 129,239.55

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Solution

The fourth proportional to 219,912.57, 303,409.80 and 129,239.55 is: 178,309.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    219,912.57 : 303,409.80 = 129,239.55 : x
  2. Step 2: Convert to fraction form
    219,912.57/303,409.80 = 129,239.55/x
  3. Step 3: Cross multiply
    219,912.57x = 303,409.80 × 129,239.55
  4. Step 4: Simplify right side
    219,912.57x = 39,212,546,017.59
  5. Step 5: Solve for x
    x = 39,212,546,017.59/219,912.57
  6. Step 6: Final answer
    x = 178,309.71

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1.5x scale

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.