Home / 81,731.88-122,612.40-31,839.12

Finding the Fourth Proportional to 81,731.88, 122,612.40 and 31,839.12

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Solution

The fourth proportional to 81,731.88, 122,612.40 and 31,839.12 is: 47,764.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,731.88 : 122,612.40 = 31,839.12 : x
  2. Step 2: Convert to fraction form
    81,731.88/122,612.40 = 31,839.12/x
  3. Step 3: Cross multiply
    81,731.88x = 122,612.40 × 31,839.12
  4. Step 4: Simplify right side
    81,731.88x = 3,903,870,917.09
  5. Step 5: Solve for x
    x = 3,903,870,917.09/81,731.88
  6. Step 6: Final answer
    x = 47,764.36

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1.5x scale

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.