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Finding the Fourth Proportional to 636.47, 878.27 and 356.75

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Solution

The fourth proportional to 636.47, 878.27 and 356.75 is: 492.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    636.47 : 878.27 = 356.75 : x
  2. Step 2: Convert to fraction form
    636.47/878.27 = 356.75/x
  3. Step 3: Cross multiply
    636.47x = 878.27 × 356.75
  4. Step 4: Simplify right side
    636.47x = 313,322.82
  5. Step 5: Solve for x
    x = 313,322.82/636.47
  6. Step 6: Final answer
    x = 492.28

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1.5x scale

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.