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Finding the Fourth Proportional to 120,712.80, 180,997.20 and 73,999.20

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Solution

The fourth proportional to 120,712.80, 180,997.20 and 73,999.20 is: 110,954.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,712.80 : 180,997.20 = 73,999.20 : x
  2. Step 2: Convert to fraction form
    120,712.80/180,997.20 = 73,999.20/x
  3. Step 3: Cross multiply
    120,712.80x = 180,997.20 × 73,999.20
  4. Step 4: Simplify right side
    120,712.80x = 13,393,648,002.24
  5. Step 5: Solve for x
    x = 13,393,648,002.24/120,712.80
  6. Step 6: Final answer
    x = 110,954.66

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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.