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Finding the Fourth Proportional to 81,343.82, 121,993.86 and 28,739.18

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Solution

The fourth proportional to 81,343.82, 121,993.86 and 28,739.18 is: 43,101.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,343.82 : 121,993.86 = 28,739.18 : x
  2. Step 2: Convert to fraction form
    81,343.82/121,993.86 = 28,739.18/x
  3. Step 3: Cross multiply
    81,343.82x = 121,993.86 × 28,739.18
  4. Step 4: Simplify right side
    81,343.82x = 3,506,003,501.43
  5. Step 5: Solve for x
    x = 3,506,003,501.43/81,343.82
  6. Step 6: Final answer
    x = 43,101.04

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.