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Finding the Fourth Proportional to 1,311.90, 1,969.06 and 663.09

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Solution

The fourth proportional to 1,311.90, 1,969.06 and 663.09 is: 995.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,311.90 : 1,969.06 = 663.09 : x
  2. Step 2: Convert to fraction form
    1,311.90/1,969.06 = 663.09/x
  3. Step 3: Cross multiply
    1,311.90x = 1,969.06 × 663.09
  4. Step 4: Simplify right side
    1,311.90x = 1,305,652.49
  5. Step 5: Solve for x
    x = 1,305,652.49/1,311.90
  6. Step 6: Final answer
    x = 995.24

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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.