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Finding the Fourth Proportional to 1,318.50, 1,976.72 and 660.64

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Solution

The fourth proportional to 1,318.50, 1,976.72 and 660.64 is: 990.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,318.50 : 1,976.72 = 660.64 : x
  2. Step 2: Convert to fraction form
    1,318.50/1,976.72 = 660.64/x
  3. Step 3: Cross multiply
    1,318.50x = 1,976.72 × 660.64
  4. Step 4: Simplify right side
    1,318.50x = 1,305,900.30
  5. Step 5: Solve for x
    x = 1,305,900.30/1,318.50
  6. Step 6: Final answer
    x = 990.44

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.