Home / 81,712.36-122,536.92-31,785.64

Finding the Fourth Proportional to 81,712.36, 122,536.92 and 31,785.64

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Solution

The fourth proportional to 81,712.36, 122,536.92 and 31,785.64 is: 47,666.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,712.36 : 122,536.92 = 31,785.64 : x
  2. Step 2: Convert to fraction form
    81,712.36/122,536.92 = 31,785.64/x
  3. Step 3: Cross multiply
    81,712.36x = 122,536.92 × 31,785.64
  4. Step 4: Simplify right side
    81,712.36x = 3,894,914,425.83
  5. Step 5: Solve for x
    x = 3,894,914,425.83/81,712.36
  6. Step 6: Final answer
    x = 47,666.16

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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.