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Finding the Fourth Proportional to 218,640.75, 301,745.70 and 127,991.22

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Solution

The fourth proportional to 218,640.75, 301,745.70 and 127,991.22 is: 176,640.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,640.75 : 301,745.70 = 127,991.22 : x
  2. Step 2: Convert to fraction form
    218,640.75/301,745.70 = 127,991.22/x
  3. Step 3: Cross multiply
    218,640.75x = 301,745.70 × 127,991.22
  4. Step 4: Simplify right side
    218,640.75x = 38,620,800,272.75
  5. Step 5: Solve for x
    x = 38,620,800,272.75/218,640.75
  6. Step 6: Final answer
    x = 176,640.45

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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.