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Finding the Fourth Proportional to 72,790.62, 100,450.62 and 40,959.78

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Solution

The fourth proportional to 72,790.62, 100,450.62 and 40,959.78 is: 56,524.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,790.62 : 100,450.62 = 40,959.78 : x
  2. Step 2: Convert to fraction form
    72,790.62/100,450.62 = 40,959.78/x
  3. Step 3: Cross multiply
    72,790.62x = 100,450.62 × 40,959.78
  4. Step 4: Simplify right side
    72,790.62x = 4,114,435,296.06
  5. Step 5: Solve for x
    x = 4,114,435,296.06/72,790.62
  6. Step 6: Final answer
    x = 56,524.25

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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.