Home / 81,278.64-121,917.96-28,654.56

Finding the Fourth Proportional to 81,278.64, 121,917.96 and 28,654.56

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Solution

The fourth proportional to 81,278.64, 121,917.96 and 28,654.56 is: 42,981.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,278.64 : 121,917.96 = 28,654.56 : x
  2. Step 2: Convert to fraction form
    81,278.64/121,917.96 = 28,654.56/x
  3. Step 3: Cross multiply
    81,278.64x = 121,917.96 × 28,654.56
  4. Step 4: Simplify right side
    81,278.64x = 3,493,505,499.90
  5. Step 5: Solve for x
    x = 3,493,505,499.90/81,278.64
  6. Step 6: Final answer
    x = 42,981.84

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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.