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Finding the Fourth Proportional to 820,879.80, 1,231,319.70 and 505,951.80

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Solution

The fourth proportional to 820,879.80, 1,231,319.70 and 505,951.80 is: 758,927.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    820,879.80 : 1,231,319.70 = 505,951.80 : x
  2. Step 2: Convert to fraction form
    820,879.80/1,231,319.70 = 505,951.80/x
  3. Step 3: Cross multiply
    820,879.80x = 1,231,319.70 × 505,951.80
  4. Step 4: Simplify right side
    820,879.80x = 622,988,418,590.46
  5. Step 5: Solve for x
    x = 622,988,418,590.46/820,879.80
  6. Step 6: Final answer
    x = 758,927.70

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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.