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Finding the Fourth Proportional to 491,770.65, 678,640.50 and 276,979.95

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Solution

The fourth proportional to 491,770.65, 678,640.50 and 276,979.95 is: 382,230.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    491,770.65 : 678,640.50 = 276,979.95 : x
  2. Step 2: Convert to fraction form
    491,770.65/678,640.50 = 276,979.95/x
  3. Step 3: Cross multiply
    491,770.65x = 678,640.50 × 276,979.95
  4. Step 4: Simplify right side
    491,770.65x = 187,969,811,757.98
  5. Step 5: Solve for x
    x = 187,969,811,757.98/491,770.65
  6. Step 6: Final answer
    x = 382,230.64

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.