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Finding the Fourth Proportional to 81,798.56, 122,699.39 and 25,637.43

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Solution

The fourth proportional to 81,798.56, 122,699.39 and 25,637.43 is: 38,456.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,798.56 : 122,699.39 = 25,637.43 : x
  2. Step 2: Convert to fraction form
    81,798.56/122,699.39 = 25,637.43/x
  3. Step 3: Cross multiply
    81,798.56x = 122,699.39 × 25,637.43
  4. Step 4: Simplify right side
    81,798.56x = 3,145,696,808.13
  5. Step 5: Solve for x
    x = 3,145,696,808.13/81,798.56
  6. Step 6: Final answer
    x = 38,456.63

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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.