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Finding the Fourth Proportional to 81,610.40, 122,386.80 and 29,021.60

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Solution

The fourth proportional to 81,610.40, 122,386.80 and 29,021.60 is: 43,522.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,610.40 : 122,386.80 = 29,021.60 : x
  2. Step 2: Convert to fraction form
    81,610.40/122,386.80 = 29,021.60/x
  3. Step 3: Cross multiply
    81,610.40x = 122,386.80 × 29,021.60
  4. Step 4: Simplify right side
    81,610.40x = 3,551,860,754.88
  5. Step 5: Solve for x
    x = 3,551,860,754.88/81,610.40
  6. Step 6: Final answer
    x = 43,522.16

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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.