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Finding the Fourth Proportional to 89,491.40, 134,121.90 and 68,611.40

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Solution

The fourth proportional to 89,491.40, 134,121.90 and 68,611.40 is: 102,828.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    89,491.40 : 134,121.90 = 68,611.40 : x
  2. Step 2: Convert to fraction form
    89,491.40/134,121.90 = 68,611.40/x
  3. Step 3: Cross multiply
    89,491.40x = 134,121.90 × 68,611.40
  4. Step 4: Simplify right side
    89,491.40x = 9,202,291,329.66
  5. Step 5: Solve for x
    x = 9,202,291,329.66/89,491.40
  6. Step 6: Final answer
    x = 102,828.78

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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.