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Finding the Fourth Proportional to 717.94, 1,076.68 and 279.16

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Solution

The fourth proportional to 717.94, 1,076.68 and 279.16 is: 418.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.94 : 1,076.68 = 279.16 : x
  2. Step 2: Convert to fraction form
    717.94/1,076.68 = 279.16/x
  3. Step 3: Cross multiply
    717.94x = 1,076.68 × 279.16
  4. Step 4: Simplify right side
    717.94x = 300,562.08
  5. Step 5: Solve for x
    x = 300,562.08/717.94
  6. Step 6: Final answer
    x = 418.65

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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.