Home / 81,969.88-122,872.73-31,981.20

Finding the Fourth Proportional to 81,969.88, 122,872.73 and 31,981.20

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Solution

The fourth proportional to 81,969.88, 122,872.73 and 31,981.20 is: 47,939.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,969.88 : 122,872.73 = 31,981.20 : x
  2. Step 2: Convert to fraction form
    81,969.88/122,872.73 = 31,981.20/x
  3. Step 3: Cross multiply
    81,969.88x = 122,872.73 × 31,981.20
  4. Step 4: Simplify right side
    81,969.88x = 3,929,617,352.68
  5. Step 5: Solve for x
    x = 3,929,617,352.68/81,969.88
  6. Step 6: Final answer
    x = 47,939.77

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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.