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Finding the Fourth Proportional to 491,511.88, 678,150.66 and 276,639.40

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Solution

The fourth proportional to 491,511.88, 678,150.66 and 276,639.40 is: 381,685.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    491,511.88 : 678,150.66 = 276,639.40 : x
  2. Step 2: Convert to fraction form
    491,511.88/678,150.66 = 276,639.40/x
  3. Step 3: Cross multiply
    491,511.88x = 678,150.66 × 276,639.40
  4. Step 4: Simplify right side
    491,511.88x = 187,603,191,692.00
  5. Step 5: Solve for x
    x = 187,603,191,692.00/491,511.88
  6. Step 6: Final answer
    x = 381,685.98

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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.