Home / 81,297.12-121,942.44-31,355.76

Finding the Fourth Proportional to 81,297.12, 121,942.44 and 31,355.76

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Solution

The fourth proportional to 81,297.12, 121,942.44 and 31,355.76 is: 47,032.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,297.12 : 121,942.44 = 31,355.76 : x
  2. Step 2: Convert to fraction form
    81,297.12/121,942.44 = 31,355.76/x
  3. Step 3: Cross multiply
    81,297.12x = 121,942.44 × 31,355.76
  4. Step 4: Simplify right side
    81,297.12x = 3,823,597,882.45
  5. Step 5: Solve for x
    x = 3,823,597,882.45/81,297.12
  6. Step 6: Final answer
    x = 47,032.39

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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.