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Finding the Fourth Proportional to 72,743.66, 100,385.30 and 40,912.56

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Solution

The fourth proportional to 72,743.66, 100,385.30 and 40,912.56 is: 56,458.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,743.66 : 100,385.30 = 40,912.56 : x
  2. Step 2: Convert to fraction form
    72,743.66/100,385.30 = 40,912.56/x
  3. Step 3: Cross multiply
    72,743.66x = 100,385.30 × 40,912.56
  4. Step 4: Simplify right side
    72,743.66x = 4,107,019,609.37
  5. Step 5: Solve for x
    x = 4,107,019,609.37/72,743.66
  6. Step 6: Final answer
    x = 56,458.80

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1.5x scale

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.