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Finding the Fourth Proportional to 949.33, 1,308.04 and 638.29

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Solution

The fourth proportional to 949.33, 1,308.04 and 638.29 is: 879.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    949.33 : 1,308.04 = 638.29 : x
  2. Step 2: Convert to fraction form
    949.33/1,308.04 = 638.29/x
  3. Step 3: Cross multiply
    949.33x = 1,308.04 × 638.29
  4. Step 4: Simplify right side
    949.33x = 834,908.85
  5. Step 5: Solve for x
    x = 834,908.85/949.33
  6. Step 6: Final answer
    x = 879.47

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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.