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Finding the Fourth Proportional to 1,305.12, 1,958.76 and 979.44

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Solution

The fourth proportional to 1,305.12, 1,958.76 and 979.44 is: 1,469.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,305.12 : 1,958.76 = 979.44 : x
  2. Step 2: Convert to fraction form
    1,305.12/1,958.76 = 979.44/x
  3. Step 3: Cross multiply
    1,305.12x = 1,958.76 × 979.44
  4. Step 4: Simplify right side
    1,305.12x = 1,918,487.89
  5. Step 5: Solve for x
    x = 1,918,487.89/1,305.12
  6. Step 6: Final answer
    x = 1,469.97

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1.5x scale

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.