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Finding the Fourth Proportional to 72,481.20, 100,028.34 and 40,651.86

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Solution

The fourth proportional to 72,481.20, 100,028.34 and 40,651.86 is: 56,101.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,481.20 : 100,028.34 = 40,651.86 : x
  2. Step 2: Convert to fraction form
    72,481.20/100,028.34 = 40,651.86/x
  3. Step 3: Cross multiply
    72,481.20x = 100,028.34 × 40,651.86
  4. Step 4: Simplify right side
    72,481.20x = 4,066,338,073.71
  5. Step 5: Solve for x
    x = 4,066,338,073.71/72,481.20
  6. Step 6: Final answer
    x = 56,101.97

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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.