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Finding the Fourth Proportional to 78,559.11, 117,839.93 and 74,571.48

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Solution

The fourth proportional to 78,559.11, 117,839.93 and 74,571.48 is: 111,858.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,559.11 : 117,839.93 = 74,571.48 : x
  2. Step 2: Convert to fraction form
    78,559.11/117,839.93 = 74,571.48/x
  3. Step 3: Cross multiply
    78,559.11x = 117,839.93 × 74,571.48
  4. Step 4: Simplify right side
    78,559.11x = 8,787,497,610.34
  5. Step 5: Solve for x
    x = 8,787,497,610.34/78,559.11
  6. Step 6: Final answer
    x = 111,858.42

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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.