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Finding the Fourth Proportional to 638.54, 882.81 and 443.51

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Solution

The fourth proportional to 638.54, 882.81 and 443.51 is: 613.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    638.54 : 882.81 = 443.51 : x
  2. Step 2: Convert to fraction form
    638.54/882.81 = 443.51/x
  3. Step 3: Cross multiply
    638.54x = 882.81 × 443.51
  4. Step 4: Simplify right side
    638.54x = 391,530.65
  5. Step 5: Solve for x
    x = 391,530.65/638.54
  6. Step 6: Final answer
    x = 613.17

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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.