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Finding the Fourth Proportional to 807,872.20, 1,211,808.30 and 275,345.80

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Solution

The fourth proportional to 807,872.20, 1,211,808.30 and 275,345.80 is: 413,018.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    807,872.20 : 1,211,808.30 = 275,345.80 : x
  2. Step 2: Convert to fraction form
    807,872.20/1,211,808.30 = 275,345.80/x
  3. Step 3: Cross multiply
    807,872.20x = 1,211,808.30 × 275,345.80
  4. Step 4: Simplify right side
    807,872.20x = 333,666,325,810.14
  5. Step 5: Solve for x
    x = 333,666,325,810.14/807,872.20
  6. Step 6: Final answer
    x = 413,018.70

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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.