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Finding the Fourth Proportional to 491,600.79, 678,473.78 and 276,782.72

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Solution

The fourth proportional to 491,600.79, 678,473.78 and 276,782.72 is: 381,996.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    491,600.79 : 678,473.78 = 276,782.72 : x
  2. Step 2: Convert to fraction form
    491,600.79/678,473.78 = 276,782.72/x
  3. Step 3: Cross multiply
    491,600.79x = 678,473.78 × 276,782.72
  4. Step 4: Simplify right side
    491,600.79x = 187,789,813,500.80
  5. Step 5: Solve for x
    x = 187,789,813,500.80/491,600.79
  6. Step 6: Final answer
    x = 381,996.57

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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.