Home / 1,188,121.20-1,782,165.60-389,428.80

Finding the Fourth Proportional to 1,188,121.20, 1,782,165.60 and 389,428.80

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Solution

The fourth proportional to 1,188,121.20, 1,782,165.60 and 389,428.80 is: 584,137.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,188,121.20 : 1,782,165.60 = 389,428.80 : x
  2. Step 2: Convert to fraction form
    1,188,121.20/1,782,165.60 = 389,428.80/x
  3. Step 3: Cross multiply
    1,188,121.20x = 1,782,165.60 × 389,428.80
  4. Step 4: Simplify right side
    1,188,121.20x = 694,026,611,009.28
  5. Step 5: Solve for x
    x = 694,026,611,009.28/1,188,121.20
  6. Step 6: Final answer
    x = 584,137.89

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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.