Home / 81,705.78-122,566.20-31,789.62

Finding the Fourth Proportional to 81,705.78, 122,566.20 and 31,789.62

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Solution

The fourth proportional to 81,705.78, 122,566.20 and 31,789.62 is: 47,687.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,705.78 : 122,566.20 = 31,789.62 : x
  2. Step 2: Convert to fraction form
    81,705.78/122,566.20 = 31,789.62/x
  3. Step 3: Cross multiply
    81,705.78x = 122,566.20 × 31,789.62
  4. Step 4: Simplify right side
    81,705.78x = 3,896,332,922.84
  5. Step 5: Solve for x
    x = 3,896,332,922.84/81,705.78
  6. Step 6: Final answer
    x = 47,687.36

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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.