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Finding the Fourth Proportional to 698.07, 963.34 and 399.28

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Solution

The fourth proportional to 698.07, 963.34 and 399.28 is: 551.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    698.07 : 963.34 = 399.28 : x
  2. Step 2: Convert to fraction form
    698.07/963.34 = 399.28/x
  3. Step 3: Cross multiply
    698.07x = 963.34 × 399.28
  4. Step 4: Simplify right side
    698.07x = 384,637.99
  5. Step 5: Solve for x
    x = 384,637.99/698.07
  6. Step 6: Final answer
    x = 551.01

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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.