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Finding the Fourth Proportional to 216,400.80, 324,543.60 and 66,640.80

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Solution

The fourth proportional to 216,400.80, 324,543.60 and 66,640.80 is: 99,943.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    216,400.80 : 324,543.60 = 66,640.80 : x
  2. Step 2: Convert to fraction form
    216,400.80/324,543.60 = 66,640.80/x
  3. Step 3: Cross multiply
    216,400.80x = 324,543.60 × 66,640.80
  4. Step 4: Simplify right side
    216,400.80x = 21,627,845,138.88
  5. Step 5: Solve for x
    x = 21,627,845,138.88/216,400.80
  6. Step 6: Final answer
    x = 99,943.46

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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.