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Finding the Fourth Proportional to 959.70, 1,321.97 and 679.44

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Solution

The fourth proportional to 959.70, 1,321.97 and 679.44 is: 935.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    959.70 : 1,321.97 = 679.44 : x
  2. Step 2: Convert to fraction form
    959.70/1,321.97 = 679.44/x
  3. Step 3: Cross multiply
    959.70x = 1,321.97 × 679.44
  4. Step 4: Simplify right side
    959.70x = 898,195.90
  5. Step 5: Solve for x
    x = 898,195.90/959.70
  6. Step 6: Final answer
    x = 935.91

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1.5x scale

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.