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Finding the Fourth Proportional to 66,129.81, 91,270.36 and 39,286.81

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Solution

The fourth proportional to 66,129.81, 91,270.36 and 39,286.81 is: 54,222.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,129.81 : 91,270.36 = 39,286.81 : x
  2. Step 2: Convert to fraction form
    66,129.81/91,270.36 = 39,286.81/x
  3. Step 3: Cross multiply
    66,129.81x = 91,270.36 × 39,286.81
  4. Step 4: Simplify right side
    66,129.81x = 3,585,721,291.95
  5. Step 5: Solve for x
    x = 3,585,721,291.95/66,129.81
  6. Step 6: Final answer
    x = 54,222.46

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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.