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Finding the Fourth Proportional to 693.28, 956.88 and 398.56

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Solution

The fourth proportional to 693.28, 956.88 and 398.56 is: 550.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    693.28 : 956.88 = 398.56 : x
  2. Step 2: Convert to fraction form
    693.28/956.88 = 398.56/x
  3. Step 3: Cross multiply
    693.28x = 956.88 × 398.56
  4. Step 4: Simplify right side
    693.28x = 381,374.09
  5. Step 5: Solve for x
    x = 381,374.09/693.28
  6. Step 6: Final answer
    x = 550.10

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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.