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Finding the Fourth Proportional to 72,169.81, 108,352.88 and 40,602.09

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Solution

The fourth proportional to 72,169.81, 108,352.88 and 40,602.09 is: 60,958.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,169.81 : 108,352.88 = 40,602.09 : x
  2. Step 2: Convert to fraction form
    72,169.81/108,352.88 = 40,602.09/x
  3. Step 3: Cross multiply
    72,169.81x = 108,352.88 × 40,602.09
  4. Step 4: Simplify right side
    72,169.81x = 4,399,352,843.75
  5. Step 5: Solve for x
    x = 4,399,352,843.75/72,169.81
  6. Step 6: Final answer
    x = 60,958.35

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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.