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Finding the Fourth Proportional to 960.86, 1,326.47 and 629.79

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Solution

The fourth proportional to 960.86, 1,326.47 and 629.79 is: 869.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    960.86 : 1,326.47 = 629.79 : x
  2. Step 2: Convert to fraction form
    960.86/1,326.47 = 629.79/x
  3. Step 3: Cross multiply
    960.86x = 1,326.47 × 629.79
  4. Step 4: Simplify right side
    960.86x = 835,394.39
  5. Step 5: Solve for x
    x = 835,394.39/960.86
  6. Step 6: Final answer
    x = 869.43

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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.