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Finding the Fourth Proportional to 1,279.70, 1,921.85 and 663.83

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Solution

The fourth proportional to 1,279.70, 1,921.85 and 663.83 is: 996.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,279.70 : 1,921.85 = 663.83 : x
  2. Step 2: Convert to fraction form
    1,279.70/1,921.85 = 663.83/x
  3. Step 3: Cross multiply
    1,279.70x = 1,921.85 × 663.83
  4. Step 4: Simplify right side
    1,279.70x = 1,275,773.74
  5. Step 5: Solve for x
    x = 1,275,773.74/1,279.70
  6. Step 6: Final answer
    x = 996.94

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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.