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Finding the Fourth Proportional to 688.62, 950.26 and 393.85

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Solution

The fourth proportional to 688.62, 950.26 and 393.85 is: 543.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    688.62 : 950.26 = 393.85 : x
  2. Step 2: Convert to fraction form
    688.62/950.26 = 393.85/x
  3. Step 3: Cross multiply
    688.62x = 950.26 × 393.85
  4. Step 4: Simplify right side
    688.62x = 374,259.90
  5. Step 5: Solve for x
    x = 374,259.90/688.62
  6. Step 6: Final answer
    x = 543.49

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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.