Home / 81,428.06-122,102-38,721.62

Finding the Fourth Proportional to 81,428.06, 122,102 and 38,721.62

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Solution

The fourth proportional to 81,428.06, 122,102 and 38,721.62 is: 58,063.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,428.06 : 122,102 = 38,721.62 : x
  2. Step 2: Convert to fraction form
    81,428.06/122,102 = 38,721.62/x
  3. Step 3: Cross multiply
    81,428.06x = 122,102 × 38,721.62
  4. Step 4: Simplify right side
    81,428.06x = 4,727,987,245.24
  5. Step 5: Solve for x
    x = 4,727,987,245.24/81,428.06
  6. Step 6: Final answer
    x = 58,063.37

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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.