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Finding the Fourth Proportional to 688.91, 950.58 and 394.13

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Solution

The fourth proportional to 688.91, 950.58 and 394.13 is: 543.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    688.91 : 950.58 = 394.13 : x
  2. Step 2: Convert to fraction form
    688.91/950.58 = 394.13/x
  3. Step 3: Cross multiply
    688.91x = 950.58 × 394.13
  4. Step 4: Simplify right side
    688.91x = 374,654.47
  5. Step 5: Solve for x
    x = 374,654.47/688.91
  6. Step 6: Final answer
    x = 543.84

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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.