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Finding the Fourth Proportional to 698.48, 963.96 and 399.79

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Solution

The fourth proportional to 698.48, 963.96 and 399.79 is: 551.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    698.48 : 963.96 = 399.79 : x
  2. Step 2: Convert to fraction form
    698.48/963.96 = 399.79/x
  3. Step 3: Cross multiply
    698.48x = 963.96 × 399.79
  4. Step 4: Simplify right side
    698.48x = 385,381.57
  5. Step 5: Solve for x
    x = 385,381.57/698.48
  6. Step 6: Final answer
    x = 551.74

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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.