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Finding the Fourth Proportional to 101,223.60, 151,738.20 and 78,721.80

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Solution

The fourth proportional to 101,223.60, 151,738.20 and 78,721.80 is: 118,007.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    101,223.60 : 151,738.20 = 78,721.80 : x
  2. Step 2: Convert to fraction form
    101,223.60/151,738.20 = 78,721.80/x
  3. Step 3: Cross multiply
    101,223.60x = 151,738.20 × 78,721.80
  4. Step 4: Simplify right side
    101,223.60x = 11,945,104,232.76
  5. Step 5: Solve for x
    x = 11,945,104,232.76/101,223.60
  6. Step 6: Final answer
    x = 118,007.11

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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.