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Finding the Fourth Proportional to 639.06, 959.49 and 628.11

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Solution

The fourth proportional to 639.06, 959.49 and 628.11 is: 943.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.06 : 959.49 = 628.11 : x
  2. Step 2: Convert to fraction form
    639.06/959.49 = 628.11/x
  3. Step 3: Cross multiply
    639.06x = 959.49 × 628.11
  4. Step 4: Simplify right side
    639.06x = 602,665.26
  5. Step 5: Solve for x
    x = 602,665.26/639.06
  6. Step 6: Final answer
    x = 943.05

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.