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Finding the Fourth Proportional to 667.36, 996.61 and 660.12

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Solution

The fourth proportional to 667.36, 996.61 and 660.12 is: 985.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.36 : 996.61 = 660.12 : x
  2. Step 2: Convert to fraction form
    667.36/996.61 = 660.12/x
  3. Step 3: Cross multiply
    667.36x = 996.61 × 660.12
  4. Step 4: Simplify right side
    667.36x = 657,880.54
  5. Step 5: Solve for x
    x = 657,880.54/667.36
  6. Step 6: Final answer
    x = 985.80

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.