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Finding the Fourth Proportional to 479.43, 717.66 and 387.36

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Solution

The fourth proportional to 479.43, 717.66 and 387.36 is: 579.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    479.43 : 717.66 = 387.36 : x
  2. Step 2: Convert to fraction form
    479.43/717.66 = 387.36/x
  3. Step 3: Cross multiply
    479.43x = 717.66 × 387.36
  4. Step 4: Simplify right side
    479.43x = 277,992.78
  5. Step 5: Solve for x
    x = 277,992.78/479.43
  6. Step 6: Final answer
    x = 579.84

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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.