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Finding the Fourth Proportional to 519,387.45, 780,451.13 and 279,678.58

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Solution

The fourth proportional to 519,387.45, 780,451.13 and 279,678.58 is: 420,255.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    519,387.45 : 780,451.13 = 279,678.58 : x
  2. Step 2: Convert to fraction form
    519,387.45/780,451.13 = 279,678.58/x
  3. Step 3: Cross multiply
    519,387.45x = 780,451.13 × 279,678.58
  4. Step 4: Simplify right side
    519,387.45x = 218,275,463,797.80
  5. Step 5: Solve for x
    x = 218,275,463,797.80/519,387.45
  6. Step 6: Final answer
    x = 420,255.56

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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.