Home / 81,872.10-122,813.82-31,935.60

Finding the Fourth Proportional to 81,872.10, 122,813.82 and 31,935.60

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Solution

The fourth proportional to 81,872.10, 122,813.82 and 31,935.60 is: 47,905.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,872.10 : 122,813.82 = 31,935.60 : x
  2. Step 2: Convert to fraction form
    81,872.10/122,813.82 = 31,935.60/x
  3. Step 3: Cross multiply
    81,872.10x = 122,813.82 × 31,935.60
  4. Step 4: Simplify right side
    81,872.10x = 3,922,133,029.99
  5. Step 5: Solve for x
    x = 3,922,133,029.99/81,872.10
  6. Step 6: Final answer
    x = 47,905.61

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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.