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Finding the Fourth Proportional to 636.65, 878.39 and 608.55

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Solution

The fourth proportional to 636.65, 878.39 and 608.55 is: 839.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    636.65 : 878.39 = 608.55 : x
  2. Step 2: Convert to fraction form
    636.65/878.39 = 608.55/x
  3. Step 3: Cross multiply
    636.65x = 878.39 × 608.55
  4. Step 4: Simplify right side
    636.65x = 534,541.19
  5. Step 5: Solve for x
    x = 534,541.19/636.65
  6. Step 6: Final answer
    x = 839.62

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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.