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Finding the Fourth Proportional to 81,685.76, 112,376.36 and 78,186.56

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Solution

The fourth proportional to 81,685.76, 112,376.36 and 78,186.56 is: 107,562.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,685.76 : 112,376.36 = 78,186.56 : x
  2. Step 2: Convert to fraction form
    81,685.76/112,376.36 = 78,186.56/x
  3. Step 3: Cross multiply
    81,685.76x = 112,376.36 × 78,186.56
  4. Step 4: Simplify right side
    81,685.76x = 8,786,321,013.72
  5. Step 5: Solve for x
    x = 8,786,321,013.72/81,685.76
  6. Step 6: Final answer
    x = 107,562.46

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.