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Finding the Fourth Proportional to 387,099.88, 580,649.60 and 120,883.21

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Solution

The fourth proportional to 387,099.88, 580,649.60 and 120,883.21 is: 181,324.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    387,099.88 : 580,649.60 = 120,883.21 : x
  2. Step 2: Convert to fraction form
    387,099.88/580,649.60 = 120,883.21/x
  3. Step 3: Cross multiply
    387,099.88x = 580,649.60 × 120,883.21
  4. Step 4: Simplify right side
    387,099.88x = 70,190,786,383.80
  5. Step 5: Solve for x
    x = 70,190,786,383.80/387,099.88
  6. Step 6: Final answer
    x = 181,324.74

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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.