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Finding the Fourth Proportional to 81,732.80, 122,660.04 and 60,721.76

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Solution

The fourth proportional to 81,732.80, 122,660.04 and 60,721.76 is: 91,127.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,732.80 : 122,660.04 = 60,721.76 : x
  2. Step 2: Convert to fraction form
    81,732.80/122,660.04 = 60,721.76/x
  3. Step 3: Cross multiply
    81,732.80x = 122,660.04 × 60,721.76
  4. Step 4: Simplify right side
    81,732.80x = 7,448,133,510.47
  5. Step 5: Solve for x
    x = 7,448,133,510.47/81,732.80
  6. Step 6: Final answer
    x = 91,127.84

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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.