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Finding the Fourth Proportional to 1,279.95, 1,767.97 and 979.37

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Solution

The fourth proportional to 1,279.95, 1,767.97 and 979.37 is: 1,352.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,279.95 : 1,767.97 = 979.37 : x
  2. Step 2: Convert to fraction form
    1,279.95/1,767.97 = 979.37/x
  3. Step 3: Cross multiply
    1,279.95x = 1,767.97 × 979.37
  4. Step 4: Simplify right side
    1,279.95x = 1,731,487.46
  5. Step 5: Solve for x
    x = 1,731,487.46/1,279.95
  6. Step 6: Final answer
    x = 1,352.78

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.