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Finding the Fourth Proportional to 539,405.80, 809,108.70 and 381,812.20

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Solution

The fourth proportional to 539,405.80, 809,108.70 and 381,812.20 is: 572,718.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    539,405.80 : 809,108.70 = 381,812.20 : x
  2. Step 2: Convert to fraction form
    539,405.80/809,108.70 = 381,812.20/x
  3. Step 3: Cross multiply
    539,405.80x = 809,108.70 × 381,812.20
  4. Step 4: Simplify right side
    539,405.80x = 308,927,572,786.14
  5. Step 5: Solve for x
    x = 308,927,572,786.14/539,405.80
  6. Step 6: Final answer
    x = 572,718.30

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Similar ratio
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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.