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Finding the Fourth Proportional to 642.82, 887.10 and 348.09

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Solution

The fourth proportional to 642.82, 887.10 and 348.09 is: 480.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    642.82 : 887.10 = 348.09 : x
  2. Step 2: Convert to fraction form
    642.82/887.10 = 348.09/x
  3. Step 3: Cross multiply
    642.82x = 887.10 × 348.09
  4. Step 4: Simplify right side
    642.82x = 308,789.33
  5. Step 5: Solve for x
    x = 308,789.33/642.82
  6. Step 6: Final answer
    x = 480.37

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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.