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Finding the Fourth Proportional to 698.51, 963.74 and 399.75

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Solution

The fourth proportional to 698.51, 963.74 and 399.75 is: 551.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    698.51 : 963.74 = 399.75 : x
  2. Step 2: Convert to fraction form
    698.51/963.74 = 399.75/x
  3. Step 3: Cross multiply
    698.51x = 963.74 × 399.75
  4. Step 4: Simplify right side
    698.51x = 385,256.06
  5. Step 5: Solve for x
    x = 385,256.06/698.51
  6. Step 6: Final answer
    x = 551.54

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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.