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Finding the Fourth Proportional to 643.26, 964.59 and 438.15

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Solution

The fourth proportional to 643.26, 964.59 and 438.15 is: 657.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.26 : 964.59 = 438.15 : x
  2. Step 2: Convert to fraction form
    643.26/964.59 = 438.15/x
  3. Step 3: Cross multiply
    643.26x = 964.59 × 438.15
  4. Step 4: Simplify right side
    643.26x = 422,635.11
  5. Step 5: Solve for x
    x = 422,635.11/643.26
  6. Step 6: Final answer
    x = 657.02

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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.