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Finding the Fourth Proportional to 81,415.88, 122,126.21 and 69,494.48

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Solution

The fourth proportional to 81,415.88, 122,126.21 and 69,494.48 is: 104,243.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,415.88 : 122,126.21 = 69,494.48 : x
  2. Step 2: Convert to fraction form
    81,415.88/122,126.21 = 69,494.48/x
  3. Step 3: Cross multiply
    81,415.88x = 122,126.21 × 69,494.48
  4. Step 4: Simplify right side
    81,415.88x = 8,487,097,937.37
  5. Step 5: Solve for x
    x = 8,487,097,937.37/81,415.88
  6. Step 6: Final answer
    x = 104,243.77

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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.