Home / 820,129.20-1,229,963.40-259,335.60

Finding the Fourth Proportional to 820,129.20, 1,229,963.40 and 259,335.60

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Solution

The fourth proportional to 820,129.20, 1,229,963.40 and 259,335.60 is: 388,930.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    820,129.20 : 1,229,963.40 = 259,335.60 : x
  2. Step 2: Convert to fraction form
    820,129.20/1,229,963.40 = 259,335.60/x
  3. Step 3: Cross multiply
    820,129.20x = 1,229,963.40 × 259,335.60
  4. Step 4: Simplify right side
    820,129.20x = 318,973,296,317.04
  5. Step 5: Solve for x
    x = 318,973,296,317.04/820,129.20
  6. Step 6: Final answer
    x = 388,930.54

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1.5x scale

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.