Home / 81,640.19-122,506.91-31,713.78

Finding the Fourth Proportional to 81,640.19, 122,506.91 and 31,713.78

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Solution

The fourth proportional to 81,640.19, 122,506.91 and 31,713.78 is: 47,588.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,640.19 : 122,506.91 = 31,713.78 : x
  2. Step 2: Convert to fraction form
    81,640.19/122,506.91 = 31,713.78/x
  3. Step 3: Cross multiply
    81,640.19x = 122,506.91 × 31,713.78
  4. Step 4: Simplify right side
    81,640.19x = 3,885,157,790.37
  5. Step 5: Solve for x
    x = 3,885,157,790.37/81,640.19
  6. Step 6: Final answer
    x = 47,588.79

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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.