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Finding the Fourth Proportional to 123,211.20, 184,816.80 and 81,220.80

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Solution

The fourth proportional to 123,211.20, 184,816.80 and 81,220.80 is: 121,831.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,211.20 : 184,816.80 = 81,220.80 : x
  2. Step 2: Convert to fraction form
    123,211.20/184,816.80 = 81,220.80/x
  3. Step 3: Cross multiply
    123,211.20x = 184,816.80 × 81,220.80
  4. Step 4: Simplify right side
    123,211.20x = 15,010,968,349.44
  5. Step 5: Solve for x
    x = 15,010,968,349.44/123,211.20
  6. Step 6: Final answer
    x = 121,831.20

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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.