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Finding the Fourth Proportional to 478,879.70, 718,319.55 and 279,425.30

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Solution

The fourth proportional to 478,879.70, 718,319.55 and 279,425.30 is: 419,137.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    478,879.70 : 718,319.55 = 279,425.30 : x
  2. Step 2: Convert to fraction form
    478,879.70/718,319.55 = 279,425.30/x
  3. Step 3: Cross multiply
    478,879.70x = 718,319.55 × 279,425.30
  4. Step 4: Simplify right side
    478,879.70x = 200,716,655,754.62
  5. Step 5: Solve for x
    x = 200,716,655,754.62/478,879.70
  6. Step 6: Final answer
    x = 419,137.95

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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.