Home / 81,690.21-122,542.89-31,774.11

Finding the Fourth Proportional to 81,690.21, 122,542.89 and 31,774.11

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Solution

The fourth proportional to 81,690.21, 122,542.89 and 31,774.11 is: 47,664.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,690.21 : 122,542.89 = 31,774.11 : x
  2. Step 2: Convert to fraction form
    81,690.21/122,542.89 = 31,774.11/x
  3. Step 3: Cross multiply
    81,690.21x = 122,542.89 × 31,774.11
  4. Step 4: Simplify right side
    81,690.21x = 3,893,691,266.58
  5. Step 5: Solve for x
    x = 3,893,691,266.58/81,690.21
  6. Step 6: Final answer
    x = 47,664.11

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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.