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Finding the Fourth Proportional to 71,770.56, 99,040.80 and 39,940.80

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Solution

The fourth proportional to 71,770.56, 99,040.80 and 39,940.80 is: 55,116.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,770.56 : 99,040.80 = 39,940.80 : x
  2. Step 2: Convert to fraction form
    71,770.56/99,040.80 = 39,940.80/x
  3. Step 3: Cross multiply
    71,770.56x = 99,040.80 × 39,940.80
  4. Step 4: Simplify right side
    71,770.56x = 3,955,768,784.64
  5. Step 5: Solve for x
    x = 3,955,768,784.64/71,770.56
  6. Step 6: Final answer
    x = 55,116.87

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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.