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Finding the Fourth Proportional to 698, 963.18 and 403.28

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Solution

The fourth proportional to 698, 963.18 and 403.28 is: 556.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    698 : 963.18 = 403.28 : x
  2. Step 2: Convert to fraction form
    698/963.18 = 403.28/x
  3. Step 3: Cross multiply
    698x = 963.18 × 403.28
  4. Step 4: Simplify right side
    698x = 388,431.23
  5. Step 5: Solve for x
    x = 388,431.23/698
  6. Step 6: Final answer
    x = 556.49

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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.