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Finding the Fourth Proportional to 478,870.20, 718,305.30 and 279,415.80

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Solution

The fourth proportional to 478,870.20, 718,305.30 and 279,415.80 is: 419,123.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    478,870.20 : 718,305.30 = 279,415.80 : x
  2. Step 2: Convert to fraction form
    478,870.20/718,305.30 = 279,415.80/x
  3. Step 3: Cross multiply
    478,870.20x = 718,305.30 × 279,415.80
  4. Step 4: Simplify right side
    478,870.20x = 200,705,850,043.74
  5. Step 5: Solve for x
    x = 200,705,850,043.74/478,870.20
  6. Step 6: Final answer
    x = 419,123.70

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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.