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Finding the Fourth Proportional to 1,279.35, 1,765 and 719.69

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Solution

The fourth proportional to 1,279.35, 1,765 and 719.69 is: 992.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,279.35 : 1,765 = 719.69 : x
  2. Step 2: Convert to fraction form
    1,279.35/1,765 = 719.69/x
  3. Step 3: Cross multiply
    1,279.35x = 1,765 × 719.69
  4. Step 4: Simplify right side
    1,279.35x = 1,270,252.85
  5. Step 5: Solve for x
    x = 1,270,252.85/1,279.35
  6. Step 6: Final answer
    x = 992.89

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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.