Home / 820,138.30-1,229,223.30-420,573.40

Finding the Fourth Proportional to 820,138.30, 1,229,223.30 and 420,573.40

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Solution

The fourth proportional to 820,138.30, 1,229,223.30 and 420,573.40 is: 630,355.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    820,138.30 : 1,229,223.30 = 420,573.40 : x
  2. Step 2: Convert to fraction form
    820,138.30/1,229,223.30 = 420,573.40/x
  3. Step 3: Cross multiply
    820,138.30x = 1,229,223.30 × 420,573.40
  4. Step 4: Simplify right side
    820,138.30x = 516,978,622,640.22
  5. Step 5: Solve for x
    x = 516,978,622,640.22/820,138.30
  6. Step 6: Final answer
    x = 630,355.42

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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.