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Finding the Fourth Proportional to 717.05, 1,076.79 and 393.05

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Solution

The fourth proportional to 717.05, 1,076.79 and 393.05 is: 590.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.05 : 1,076.79 = 393.05 : x
  2. Step 2: Convert to fraction form
    717.05/1,076.79 = 393.05/x
  3. Step 3: Cross multiply
    717.05x = 1,076.79 × 393.05
  4. Step 4: Simplify right side
    717.05x = 423,232.31
  5. Step 5: Solve for x
    x = 423,232.31/717.05
  6. Step 6: Final answer
    x = 590.24

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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.