Home / 81,916-122,778.14-31,281.88

Finding the Fourth Proportional to 81,916, 122,778.14 and 31,281.88

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Solution

The fourth proportional to 81,916, 122,778.14 and 31,281.88 is: 46,886.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,916 : 122,778.14 = 31,281.88 : x
  2. Step 2: Convert to fraction form
    81,916/122,778.14 = 31,281.88/x
  3. Step 3: Cross multiply
    81,916x = 122,778.14 × 31,281.88
  4. Step 4: Simplify right side
    81,916x = 3,840,731,042.10
  5. Step 5: Solve for x
    x = 3,840,731,042.10/81,916
  6. Step 6: Final answer
    x = 46,886.21

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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.