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Finding the Fourth Proportional to 960.89, 1,326.56 and 629.80

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Solution

The fourth proportional to 960.89, 1,326.56 and 629.80 is: 869.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    960.89 : 1,326.56 = 629.80 : x
  2. Step 2: Convert to fraction form
    960.89/1,326.56 = 629.80/x
  3. Step 3: Cross multiply
    960.89x = 1,326.56 × 629.80
  4. Step 4: Simplify right side
    960.89x = 835,461.02
  5. Step 5: Solve for x
    x = 835,461.02/960.89
  6. Step 6: Final answer
    x = 869.47

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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.