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Finding the Fourth Proportional to 636.53, 878.36 and 387.93

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Solution

The fourth proportional to 636.53, 878.36 and 387.93 is: 535.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    636.53 : 878.36 = 387.93 : x
  2. Step 2: Convert to fraction form
    636.53/878.36 = 387.93/x
  3. Step 3: Cross multiply
    636.53x = 878.36 × 387.93
  4. Step 4: Simplify right side
    636.53x = 340,736.96
  5. Step 5: Solve for x
    x = 340,736.96/636.53
  6. Step 6: Final answer
    x = 535.30

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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.