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Finding the Fourth Proportional to 100,861.64, 139,183.55 and 55,531.01

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Solution

The fourth proportional to 100,861.64, 139,183.55 and 55,531.01 is: 76,629.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,861.64 : 139,183.55 = 55,531.01 : x
  2. Step 2: Convert to fraction form
    100,861.64/139,183.55 = 55,531.01/x
  3. Step 3: Cross multiply
    100,861.64x = 139,183.55 × 55,531.01
  4. Step 4: Simplify right side
    100,861.64x = 7,729,003,385.43
  5. Step 5: Solve for x
    x = 7,729,003,385.43/100,861.64
  6. Step 6: Final answer
    x = 76,629.76

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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.