Home / 820,455.30-1,229,698.80-420,890.40

Finding the Fourth Proportional to 820,455.30, 1,229,698.80 and 420,890.40

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Solution

The fourth proportional to 820,455.30, 1,229,698.80 and 420,890.40 is: 630,830.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    820,455.30 : 1,229,698.80 = 420,890.40 : x
  2. Step 2: Convert to fraction form
    820,455.30/1,229,698.80 = 420,890.40/x
  3. Step 3: Cross multiply
    820,455.30x = 1,229,698.80 × 420,890.40
  4. Step 4: Simplify right side
    820,455.30x = 517,568,419,811.52
  5. Step 5: Solve for x
    x = 517,568,419,811.52/820,455.30
  6. Step 6: Final answer
    x = 630,830.73

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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.