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Finding the Fourth Proportional to 688.69, 950.38 and 393.94

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Solution

The fourth proportional to 688.69, 950.38 and 393.94 is: 543.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    688.69 : 950.38 = 393.94 : x
  2. Step 2: Convert to fraction form
    688.69/950.38 = 393.94/x
  3. Step 3: Cross multiply
    688.69x = 950.38 × 393.94
  4. Step 4: Simplify right side
    688.69x = 374,392.70
  5. Step 5: Solve for x
    x = 374,392.70/688.69
  6. Step 6: Final answer
    x = 543.63

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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.