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Finding the Fourth Proportional to 960.81, 1,326.06 and 711.78

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Solution

The fourth proportional to 960.81, 1,326.06 and 711.78 is: 982.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    960.81 : 1,326.06 = 711.78 : x
  2. Step 2: Convert to fraction form
    960.81/1,326.06 = 711.78/x
  3. Step 3: Cross multiply
    960.81x = 1,326.06 × 711.78
  4. Step 4: Simplify right side
    960.81x = 943,862.99
  5. Step 5: Solve for x
    x = 943,862.99/960.81
  6. Step 6: Final answer
    x = 982.36

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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.