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Finding the Fourth Proportional to 1,279.76, 1,764.90 and 927.99

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Solution

The fourth proportional to 1,279.76, 1,764.90 and 927.99 is: 1,279.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,279.76 : 1,764.90 = 927.99 : x
  2. Step 2: Convert to fraction form
    1,279.76/1,764.90 = 927.99/x
  3. Step 3: Cross multiply
    1,279.76x = 1,764.90 × 927.99
  4. Step 4: Simplify right side
    1,279.76x = 1,637,809.55
  5. Step 5: Solve for x
    x = 1,637,809.55/1,279.76
  6. Step 6: Final answer
    x = 1,279.78

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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.