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Finding the Fourth Proportional to 519,387.83, 780,451.70 and 279,678.96

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Solution

The fourth proportional to 519,387.83, 780,451.70 and 279,678.96 is: 420,256.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    519,387.83 : 780,451.70 = 279,678.96 : x
  2. Step 2: Convert to fraction form
    519,387.83/780,451.70 = 279,678.96/x
  3. Step 3: Cross multiply
    519,387.83x = 780,451.70 × 279,678.96
  4. Step 4: Simplify right side
    519,387.83x = 218,275,921,737.36
  5. Step 5: Solve for x
    x = 218,275,921,737.36/519,387.83
  6. Step 6: Final answer
    x = 420,256.13

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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.