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Finding the Fourth Proportional to 663.44, 993.42 and 643.95

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Solution

The fourth proportional to 663.44, 993.42 and 643.95 is: 964.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    663.44 : 993.42 = 643.95 : x
  2. Step 2: Convert to fraction form
    663.44/993.42 = 643.95/x
  3. Step 3: Cross multiply
    663.44x = 993.42 × 643.95
  4. Step 4: Simplify right side
    663.44x = 639,712.81
  5. Step 5: Solve for x
    x = 639,712.81/663.44
  6. Step 6: Final answer
    x = 964.24

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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.