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Finding the Fourth Proportional to 81,111.88, 121,667.82 and 25,707.88

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Solution

The fourth proportional to 81,111.88, 121,667.82 and 25,707.88 is: 38,561.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,111.88 : 121,667.82 = 25,707.88 : x
  2. Step 2: Convert to fraction form
    81,111.88/121,667.82 = 25,707.88/x
  3. Step 3: Cross multiply
    81,111.88x = 121,667.82 × 25,707.88
  4. Step 4: Simplify right side
    81,111.88x = 3,127,820,979.54
  5. Step 5: Solve for x
    x = 3,127,820,979.54/81,111.88
  6. Step 6: Final answer
    x = 38,561.81

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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.