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Finding the Fourth Proportional to 698.88, 963.93 and 667.86

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Solution

The fourth proportional to 698.88, 963.93 and 667.86 is: 921.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    698.88 : 963.93 = 667.86 : x
  2. Step 2: Convert to fraction form
    698.88/963.93 = 667.86/x
  3. Step 3: Cross multiply
    698.88x = 963.93 × 667.86
  4. Step 4: Simplify right side
    698.88x = 643,770.29
  5. Step 5: Solve for x
    x = 643,770.29/698.88
  6. Step 6: Final answer
    x = 921.15

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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.