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Finding the Fourth Proportional to 207,955.91, 311,933.79 and 81,655.58

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Solution

The fourth proportional to 207,955.91, 311,933.79 and 81,655.58 is: 122,483.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    207,955.91 : 311,933.79 = 81,655.58 : x
  2. Step 2: Convert to fraction form
    207,955.91/311,933.79 = 81,655.58/x
  3. Step 3: Cross multiply
    207,955.91x = 311,933.79 × 81,655.58
  4. Step 4: Simplify right side
    207,955.91x = 25,471,135,323.88
  5. Step 5: Solve for x
    x = 25,471,135,323.88/207,955.91
  6. Step 6: Final answer
    x = 122,483.34

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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.