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Finding the Fourth Proportional to 636.70, 878.76 and 620.05

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Solution

The fourth proportional to 636.70, 878.76 and 620.05 is: 855.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    636.70 : 878.76 = 620.05 : x
  2. Step 2: Convert to fraction form
    636.70/878.76 = 620.05/x
  3. Step 3: Cross multiply
    636.70x = 878.76 × 620.05
  4. Step 4: Simplify right side
    636.70x = 544,875.14
  5. Step 5: Solve for x
    x = 544,875.14/636.70
  6. Step 6: Final answer
    x = 855.78

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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.