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Finding the Fourth Proportional to 1,305.87, 1,958.79 and 656.46

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Solution

The fourth proportional to 1,305.87, 1,958.79 and 656.46 is: 984.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,305.87 : 1,958.79 = 656.46 : x
  2. Step 2: Convert to fraction form
    1,305.87/1,958.79 = 656.46/x
  3. Step 3: Cross multiply
    1,305.87x = 1,958.79 × 656.46
  4. Step 4: Simplify right side
    1,305.87x = 1,285,867.28
  5. Step 5: Solve for x
    x = 1,285,867.28/1,305.87
  6. Step 6: Final answer
    x = 984.68

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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.