Home / 81,712.46-122,537.09-31,785.81

Finding the Fourth Proportional to 81,712.46, 122,537.09 and 31,785.81

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Solution

The fourth proportional to 81,712.46, 122,537.09 and 31,785.81 is: 47,666.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,712.46 : 122,537.09 = 31,785.81 : x
  2. Step 2: Convert to fraction form
    81,712.46/122,537.09 = 31,785.81/x
  3. Step 3: Cross multiply
    81,712.46x = 122,537.09 × 31,785.81
  4. Step 4: Simplify right side
    81,712.46x = 3,894,940,501.76
  5. Step 5: Solve for x
    x = 3,894,940,501.76/81,712.46
  6. Step 6: Final answer
    x = 47,666.42

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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.