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Finding the Fourth Proportional to 688.64, 950.34 and 393.91

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Solution

The fourth proportional to 688.64, 950.34 and 393.91 is: 543.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    688.64 : 950.34 = 393.91 : x
  2. Step 2: Convert to fraction form
    688.64/950.34 = 393.91/x
  3. Step 3: Cross multiply
    688.64x = 950.34 × 393.91
  4. Step 4: Simplify right side
    688.64x = 374,346.05
  5. Step 5: Solve for x
    x = 374,346.05/688.64
  6. Step 6: Final answer
    x = 543.60

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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.