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Finding the Fourth Proportional to 663.33, 994.98 and 643.28

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Solution

The fourth proportional to 663.33, 994.98 and 643.28 is: 964.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    663.33 : 994.98 = 643.28 : x
  2. Step 2: Convert to fraction form
    663.33/994.98 = 643.28/x
  3. Step 3: Cross multiply
    663.33x = 994.98 × 643.28
  4. Step 4: Simplify right side
    663.33x = 640,050.73
  5. Step 5: Solve for x
    x = 640,050.73/663.33
  6. Step 6: Final answer
    x = 964.91

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.