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Finding the Fourth Proportional to 699.20, 965.04 and 640.88

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Solution

The fourth proportional to 699.20, 965.04 and 640.88 is: 884.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    699.20 : 965.04 = 640.88 : x
  2. Step 2: Convert to fraction form
    699.20/965.04 = 640.88/x
  3. Step 3: Cross multiply
    699.20x = 965.04 × 640.88
  4. Step 4: Simplify right side
    699.20x = 618,474.84
  5. Step 5: Solve for x
    x = 618,474.84/699.20
  6. Step 6: Final answer
    x = 884.55

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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.