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Finding the Fourth Proportional to 1,279.23, 1,765.08 and 719.61

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Solution

The fourth proportional to 1,279.23, 1,765.08 and 719.61 is: 992.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,279.23 : 1,765.08 = 719.61 : x
  2. Step 2: Convert to fraction form
    1,279.23/1,765.08 = 719.61/x
  3. Step 3: Cross multiply
    1,279.23x = 1,765.08 × 719.61
  4. Step 4: Simplify right side
    1,279.23x = 1,270,169.22
  5. Step 5: Solve for x
    x = 1,270,169.22/1,279.23
  6. Step 6: Final answer
    x = 992.92

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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.