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Finding the Fourth Proportional to 698.62, 964.12 and 388.12

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Solution

The fourth proportional to 698.62, 964.12 and 388.12 is: 535.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    698.62 : 964.12 = 388.12 : x
  2. Step 2: Convert to fraction form
    698.62/964.12 = 388.12/x
  3. Step 3: Cross multiply
    698.62x = 964.12 × 388.12
  4. Step 4: Simplify right side
    698.62x = 374,194.25
  5. Step 5: Solve for x
    x = 374,194.25/698.62
  6. Step 6: Final answer
    x = 535.62

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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.