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Finding the Fourth Proportional to 71,975.80, 108,012.30 and 40,385.80

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Solution

The fourth proportional to 71,975.80, 108,012.30 and 40,385.80 is: 60,605.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,975.80 : 108,012.30 = 40,385.80 : x
  2. Step 2: Convert to fraction form
    71,975.80/108,012.30 = 40,385.80/x
  3. Step 3: Cross multiply
    71,975.80x = 108,012.30 × 40,385.80
  4. Step 4: Simplify right side
    71,975.80x = 4,362,163,145.34
  5. Step 5: Solve for x
    x = 4,362,163,145.34/71,975.80
  6. Step 6: Final answer
    x = 60,605.97

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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.