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Finding the Fourth Proportional to 688.40, 950.04 and 393.76

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Solution

The fourth proportional to 688.40, 950.04 and 393.76 is: 543.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    688.40 : 950.04 = 393.76 : x
  2. Step 2: Convert to fraction form
    688.40/950.04 = 393.76/x
  3. Step 3: Cross multiply
    688.40x = 950.04 × 393.76
  4. Step 4: Simplify right side
    688.40x = 374,087.75
  5. Step 5: Solve for x
    x = 374,087.75/688.40
  6. Step 6: Final answer
    x = 543.42

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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.