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Finding the Fourth Proportional to 66,405, 91,640.22 and 36,190.20

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Solution

The fourth proportional to 66,405, 91,640.22 and 36,190.20 is: 49,943.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,405 : 91,640.22 = 36,190.20 : x
  2. Step 2: Convert to fraction form
    66,405/91,640.22 = 36,190.20/x
  3. Step 3: Cross multiply
    66,405x = 91,640.22 × 36,190.20
  4. Step 4: Simplify right side
    66,405x = 3,316,477,889.84
  5. Step 5: Solve for x
    x = 3,316,477,889.84/66,405
  6. Step 6: Final answer
    x = 49,943.20

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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.